Room for DramaOutside, Actually.

Method

What is actually being calculated

Most of what this product says comes out of geometry rather than out of a table of opinions. Here is the chain, and here is where each link stops being reliable.

The chain, in one picture

Evidence in, verdict out — and where it can refuse to answer

How Exposure Atlas reaches a verdictFour kinds of evidence feed one scene. The engine works out the sun, the light arriving, what your obstructions do to it and how much sky the spot can see. That produces seven independent readings. The use you picked turns those readings into limits, and the limits produce a verdict with a confidence. A heavy unknown at any stage makes the verdict unanswerable rather than confident.EVIDENCEWhat you drewWalls, fences, canopy, theseat and where it facesWhere and whenLatitude, timezone, the hour,the day of the yearClimateNormals for the place, ornothing, said plainlyWhat you told usObservations, measurements,correctionsONE SCENE, PUT THROUGH THE SUNSun positionNOAA, in real local time→Light arrivingClear sky, then cloud, thenthe beam and diffuse split→Your obstructionsA ray traced to the sunthrough real geometry→Sky visibleCosine-weighted hemispheresamplingSEVEN READINGS, EACH WITH ITS OWN WORKINGS AND ITS OWN DRIVERSDirect sunFelt heatGlareWindWetnessPrivacyNightThe use you pickedDinner needs different things from a nap, a nursery bed or a phone call.→Works · Tight · No · UnansweredWith a confidence, the controlling failure, and what would change it.a heavy unknown lands here insteadA heavy unknown anywhere above does not get averaged over. It travels down the chain and makes the verdictunanswerable, which is a different thing from a low score.

Evidence

  • What you drew. Walls, fences, canopy, the seat and where it faces
  • Where and when. Latitude, timezone, the hour, the day of the year
  • Climate. Normals for the place, or nothing, said plainly
  • What you told us. Observations, measurements, corrections

One scene, put through the sun

  1. Sun position. NOAA, in real local time
  2. Light arriving. Clear sky, then cloud, then the beam and diffuse split
  3. Your obstructions. A ray traced to the sun through real geometry
  4. Sky visible. Cosine-weighted hemisphere sampling

Then

That produces seven independent readings — direct sun, felt heat, glare, wind, wetness, privacy, night — each carrying its own workings and its own drivers. The use you picked turns readings into limits, because dinner needs different things from a nap or a nursery bed. The limits produce a verdict, a confidence, the controlling failure and what would change it.

A heavy unknown anywhere above does not get averaged over. It travels down the chain and makes the verdict unanswerable, which is a different thing from a low score.

1

Where the sun is

Solar position is computed from the NOAA algorithm in UTC, and local clock times are resolved through the property's actual timezone rather than a stored offset. That second part matters more than it sounds: a fixed offset is an hour wrong for half the year, and an hour moves every shade answer with it.

Where it stops: Positional astronomy is the easy part. It says nothing about how much energy arrives.

2

How much light arrives

Clear-sky beam and diffuse irradiance come from the ASHRAE model with air mass after Kasten and Young. Cloud is applied with the Kasten and Czeplak global relation, and the beam and diffuse split is recovered with the Erbs correlation, which correctly collapses the beam far faster than the diffuse under heavy cloud.

Where it stops: Site-specific optical depths come from published station tables. Where a site has none, a seasonal approximation is substituted and the interface says so.

3

What your property does to it

Every obstruction is a real object with a footprint, an underside, a top and an opacity. A ray is traced from the point to the sun and the transmittance along it is the answer. Tree canopies are modelled as crowns with a leaf-on and leaf-off state, and louvres block according to the angle the light arrives at, which is why a pergola and an awning are different decisions.

Where it stops: Everything is modelled as vertical prisms and ellipsoids. A complicated roof is an approximation.

4

How much sky it can see

The hemisphere is sampled so that every sample carries the same cosine-weighted share of sky. The mean transmittance over those samples is the sky view factor, and it reduces to the familiar horizon-elevation formula when things block from the ground up. It drives diffuse light, night cooling and how sheltered from rain a spot is.

Where it stops: An isotropic sky. Real skies are brighter near the sun and near the horizon.

5

What it feels like

Shortwave and longwave fluxes at a person are integrated over six directions to give a mean radiant temperature, following the standard outdoor method. That, air temperature and wind at seat height give an operative temperature after ASHRAE 55, and humidity or wind chill is applied at the ends where each matters. Every driver is found by ablation: remove the influence, recompute, report the difference. The explanation and the number therefore cannot drift apart.

Where it stops: Screening grade. It is good enough to say a seat runs ten degrees above shaded air at half past four. It is not a thermal comfort study.

6

Who can see whom

A sightline is a ray from an eye to an eye, traced against the same scene. The height a barrier needs at any position is solved from the geometry, and the width it needs comes from the angle the target zone occupies as seen from the observer. That is why a screen near you is short and wide, and one near them is tall and narrow.

Where it stops: It assumes people are where you put them. Two metres of seat position changes a sightline more than most things you could measure.

7

How long things stay wet

Evaporation is the Penman combination equation, run hour by hour on the radiation and air that actually reach that surface, with a mass-transfer allowance for fabric and foam which expose far more surface to moving air than a puddle does. That is what turns 'it rains a lot here' into 'the cushions are dry by ten in June and never in November'.

Where it stops: Derived for open water and short grass. The fabric allowance is an explicit multiplier, not something the equation covers.

8

What we do not know

Anything the product cannot answer says so instead of substituting an average. Where something is uncertain, the plausible range is put through the whole model and the spread in the answer decides whether it is worth going outside to measure. A fence height that changes nothing is not worth a tape measure.

Where it stops: It can only be uncertain about things somebody has told it exist.

The reference layer

Anything the product asserts that did not come out of the geometry is carried in a reference layer with the source behind it and the point at which it stops being reliable. Evidence verification and human signoff are tracked separately: checking an authoritative publisher or peer-reviewed record can clear an evidence warning, but it can never pretend that a person read a paywalled standard when they did not.

Consistent65 sources30 material families40 plant archetypes40 interventions118 declared rules0 evidence audits outstanding31 human signoffs pending

31 source records currently carry an explicit publisher, peer-reviewed or reference audit. Human signoff remains a separate stronger state and is never inferred from this automated evidence pass.

Every number this thing decides on

The claim is that nothing here is a tuned weight you cannot see. That is only true if the constants are somewhere you can read them with the reason beside them, so here they are: the bound, where it fires, and why it is that number rather than one nearby. Where a published source describes the phenomenon but does not define Exposure Atlas’s exact cut point, the rationale now says that explicitly.

RuleBoundWhere
A moment counts as being in direct sun once at least half the beam reaches the point.
Dappled light under a canopy has a transmittance that wanders either side of a half all day. Anything lower and a bed under a tree reports full sun; anything higher and a spot that is visibly sunlit through a pergola reports shade.		at least 0.5 fraction of beamsun/day
Global solar energy converts to photosynthetic photon flux at 2.02 micromoles per joule.
The conversion for broadband daylight. It shifts a few per cent between clear and overcast skies and under a canopy, which is well inside the uncertainty the daily light integral already carries.		2.02 µmol/Jsun/day
Under a clear sky, ultraviolet is 4.5 per cent of the global solar energy reaching the ground.
A deterministic atmospheric approximation used by the daily UV channel. Published observations show that the UV-to-shortwave ratio varies with cloud, ozone, aerosol and water vapour, so 4.5% is a central modelling value rather than a universal measured constant.		0.045 fraction of globalsun/day
The ultraviolet share rises by 3.5 percentage points as the sky goes from clear to fully scattered.
A deterministic approximation that lets UV retain a larger share of total shortwave as radiation becomes more diffuse. Research supports the direction and non-linearity of the cloud effect, but not a universal +3.5 percentage-point coefficient.		0.035 fraction of globalsun/day
A quarter of the days in a month are treated as genuinely half-covered; the rest are near-clear or near-solid.
Observed daily cloud cover is U-shaped: skies are usually nearly clear or nearly solid and rarely half. This share is what lets a three-state decomposition carry the curvature of a convex attenuation curve that must not be evaluated at the mean.		0.25 share of dayssun/irradiance
A surface hour counts as punishing once the surface passes forty-five degrees.
Skin blanches at around fifty degrees and burns not far above it. The threshold sits below the injury point rather than at it, because the reading is meant to warn before the burn rather than record it.		above 45 Cexposure/daily
Below nineteen degrees operative, humidity is not what decides whether a place works.
A product handover point: below this, the humidity correction is deliberately suppressed so a cool damp evening is not made warmer by a branch intended for warm conditions. BOM apparent-temperature guidance supports the variables; it does not prescribe this 19°C threshold.		above 19 Cexposure/thermal
The heat index begins taking over from Steadman's apparent temperature at twenty-six degrees.
A product blending boundary between the lower-temperature apparent-temperature branch and the NWS heat-index branch. NWS documents the heat-index equation and its warm-condition use; neither NWS nor BOM specifies Exposure Atlas's cross-fade interval.		above 26 Cexposure/thermal
Above twenty-nine degrees, the heat index alone reports the felt temperature.
Comfortably inside the regression's valid range, and the figure people recognise from a forecast.		above 29 Cexposure/thermal
A clothed person absorbs seventy per cent of the shortwave radiation falling on them.
The standard value for average clothing. It is genuinely a property of what somebody is wearing, which the product cannot know, and it is one of the larger uncertainties in the felt temperature.		0.7 fractionexposure/thermal
A person radiates as a near-black body at 0.97 emissivity.
Skin and clothing are both close to black in the longwave. This one is not controversial.		0.97 emissivityexposure/thermal
Where no surface is mapped, the ground is assumed to reflect a fifth of the light falling on it.
Roughly grass or mid-tone paving. It is a default rather than a measurement, and mapping the actual surface moves the answer, which is why the interface asks.		0.2 albedoexposure/derive
Where no wall finish is known, nearby walls are assumed to reflect just over a third.
Between render and brick. A pale rendered wall is nearly double this and is the single most common reason a courtyard runs hotter than the model says.		0.35 albedoexposure/derive
The daily temperature peak lags solar noon by up to one hour and forty-eight minutes.
The lag between peak radiation and peak air temperature. It is why an afternoon terrace is hottest well after the sun has begun to drop, and why a verdict at solar noon is the wrong reading to take.		at most 1.8 hclimate/diurnal
After sunset the air cools on an exponential decay with a shape constant of 2.2.
Fitted by Parton and Logan against observed night-time profiles. It decides how much of the evening a terrace keeps, which is most of what the after-dark readings are about.		2.2 decay constantclimate/diurnal
A windbreak that is about forty per cent open shelters further than a solid one.
A solid barrier throws air over the top and drops it in a turbulent wake a few heights downwind. A porous one bleeds air through and lengthens the sheltered zone considerably. It is the most counter-intuitive number in the model, which is exactly why it is declared rather than buried.		0.4 fraction openexposure/wind
No single barrier is credited with removing more than three quarters of the wind.
Field measurements downwind of shelterbelts rarely show more, and a model that lets a fence take ninety per cent of the wind will happily recommend one where it cannot work.		at most 0.75 fraction removedexposure/wind
A suburban site is modelled with an aerodynamic roughness length of 0.4 metres.
The standard land-use class for houses and gardens, and the default. It is what turns a ten-metre reference wind into the wind at a seated person, and getting the class wrong moves that by more than most interventions do.		0.4 mexposure/wind
Open country is modelled with an aerodynamic roughness length of 0.03 metres.
The class for an exposed rural site, where the same reference wind arrives far stronger at the ground.		0.03 mexposure/wind
A dense urban site is modelled with an aerodynamic roughness length of 2 metres.
It makes the ground-level wind low and the model must not be trusted too far here: dense city air is dominated by channelling and downwash between buildings, which a roughness length cannot express.		2 mexposure/wind
The sky is sampled in thirty-six directions around the horizon.
Ten degrees apart. Coarser and a narrow gap between two buildings is missed entirely; finer costs time for a change well inside the uncertainty of the geometry it is tracing.		36 directionsgeom/sky
The sky is sampled in twelve rings of equal solid-angle contribution.
The rings are spaced so that sine squared of the altitude is uniform, which makes every sample carry the same cosine-weighted share of the hemisphere. Uniform angular spacing would over-weight the horizon, where obstructions are, and quietly understate the sky.		12 ringsgeom/sky
Anything the property record holds at below 0.65 confidence is worth going and measuring.
The line between a figure that is good enough to answer with and one where the honest next step is a tape measure. It decides what the product asks the owner to go and find out, which is the one place it spends their time.		below 0.65 confidencereasoning/infogain
A hardiness zone is a ten-degree Fahrenheit band of extreme winter minimum, starting at minus sixty for zone one.
The USDA definition. It is carried so the product can convert a stated extreme minimum into the zone people actually shop by, and so it can say that hardiness only decides survival and never decides performance.		10 Fcarrier/plant-fit
The growing season is taken as the 183 days from April to September.
A northern-hemisphere convention, and a known limitation: it is wrong by half a year in the southern hemisphere and wrong in kind in the tropics, where there is no season to average over.		183 daysexposure/daily
Each month is represented by the fifteenth, and its readings multiplied by 30.4 days.
Twelve traced days rather than three hundred and sixty-five. The mid-month day is close to the month's mean declination, so the error is small and the saving is two orders of magnitude.		30.4 days/monthexposure/daily
Below four moles a day is called deep shade.
Beneath this, very little does more than persist. It is the level at which the honest advice is to change the geometry rather than the plant.		below 4 mol/m2/dayexposure/daily
Four to ten moles a day is called shade.
The range where shade-adapted planting thrives and everything else merely survives.		below 10 mol/m2/dayexposure/daily
Ten to eighteen moles a day is called part shade.
Enough for most foliage and for leafy crops, short of what fruiting crops need.		below 18 mol/m2/dayexposure/daily
Eighteen to twenty-eight moles a day is called part sun.
The band where a tomato starts to be worth attempting.		below 28 mol/m2/dayexposure/daily
Above 1.1 megajoules a square metre a day, ultraviolet exposure is called harsh.
An Exposure Atlas material-risk band chosen so high cumulative UV cannot pass as benign. ASTM outdoor/xenon weathering practices establish that UV exposure matters to material durability, while atmospheric-radiation studies show that site UV varies; no cited standard defines 1.1 MJ/m²/day as a universal harsh threshold.		above 1.1 MJ/m2/dayexposure/daily
Above 0.6 megajoules a square metre a day, ultraviolet exposure stops being gentle.
An Exposure Atlas screening boundary between low and material UV pressure, not an ASTM classification. Outdoor-weathering and atmospheric-radiation sources support the phenomenon; local material response remains product-specific.		above 0.6 MJ/m2/dayexposure/daily
A surface that dries within three hours is called quick-drying.
A product usability band: three hours is short enough that a shower before lunch need not decide the afternoon. Penman and FAO-56 support the evaporation relationships behind drying capacity; neither source defines this patio-use threshold.		at most 3 hexposure/daily
A surface taking more than seven hours to dry is called slow.
A product usability band: beyond seven hours, wetness commonly occupies most of the usable day. Evaporation literature supports the drying physics and UKSRG guidance supports treating wet/contaminated surface condition as relevant to slip; neither defines seven hours as a standard limit.		above 7 hexposure/daily
More than four hours a day above the surface heat threshold is called punishing.
Long enough that there is no time of day when the surface is usable barefoot, rather than merely a hot hour to avoid.		above 4 hexposure/daily
A surface peaking above fifty-two degrees is called too hot to touch.
Above the point at which contact causes injury rather than discomfort.		above 52 Cexposure/daily
A surface peaking above forty-two degrees is called hot underfoot.
Where a dog will not lie down and a person in shoes still notices.		above 42 Cexposure/daily
More than fifty-five freeze-thaw cycles a year is called severe.
The range in which unrated paving, terracotta and unsealed masonry fail within a few winters rather than a few decades.		above 55 cycles/yearexposure/daily
More than twenty freeze-thaw cycles a year is enough to matter.
The point at which frost rating stops being an upsell and starts being the specification.		above 20 cycles/yearexposure/daily
A place that never dries within the day for more than four months of the year is called wet and slow to dry.
A product seasonality band: more than four persistently slow-drying months means wet exposure is a recurring design condition rather than an occasional event. EN 335 supports classifying wood service exposure by wetting regime but does not define this four-month cut point.		above 4 monthsexposure/daily
Up to twenty-six degrees apparent is called comfortable.
An Exposure Atlas outdoor-use label, not an ISO 7730 comfort limit. ASHRAE 55 and ISO 7730 provide moderate indoor thermal-comfort context; the app deliberately uses wider, activity-oriented outdoor bands.		at most 26 Cexposure/thermal
Up to thirty-two degrees apparent is called warm rather than hot.
An Exposure Atlas outdoor-use label. UTCI confirms that outdoor thermal stress depends on temperature, wind, humidity and radiation, but the app does not implement UTCI and 32°C here is not a UTCI category boundary.		at most 32 Cexposure/thermal
Above thirty-nine degrees apparent is called severe heat.
An Exposure Atlas escalation boundary used to separate a comfort problem from potentially hazardous heat. NWS heat-index and UTCI literature provide heat-stress context; 39°C here is not represented as an official UTCI or NWS category threshold.		above 39 Cexposure/thermal
Below sixteen degrees apparent is called cool.
Where a seated person stops being comfortable in what they walked outside wearing.		below 16 Cexposure/thermal
Below eight degrees apparent is called cold.
Below this, sitting outside is a decision about clothing and heat rather than about the place.		below 8 Cexposure/thermal
Six hours of direct sun or more on a midsummer day is called full sun.
The figure printed on plant labels. It is kept here so the product can say the label's own number back and then say what the light actually adds up to, which is the more useful answer.		at least 6 hexposure/daily
Three hours of direct sun is the boundary between part sun and shade.
The other figure on the label, kept for the same reason.		at least 3 hexposure/daily
For dinner outside, felt must be at most 28C.
Nobody finishes a meal in a seat that is cooking.		at most 28 Creasoning/intents
For dinner outside, glare must be at most 28 on the reporting scale.
You cannot look at the person across the table with the sun behind their head.		at most 28 0-100 scalereasoning/intents
For dinner outside, wind must be at most 4m/s.
Wind takes napkins, candles and conversation before it takes comfort.		at most 4 m/sreasoning/intents
For dinner outside, wetness must be at most 45 on the reporting scale.
A damp seat ends dinner faster than a cold one.		at most 45 0-100 scalereasoning/intents
For dinner outside, privacy must be at most 45 on the reporting scale.
Being watched while you eat is a real reason people stop using a terrace.		at most 45 0-100 scalereasoning/intents
For dinner outside, view must be at least 40 on the reporting scale.
Half the point of eating out here is what you are looking at.		at least 40 0-100 scalereasoning/intents
For dinner outside, noise must be at most 65 on the reporting scale.
Conversation has to survive it.		at most 65 0-100 scalereasoning/intents
For morning coffee, felt must be at most 27C.
Early sun is usually the point, not the problem.		at most 27 Creasoning/intents
For morning coffee, glare must be at most 45 on the reporting scale.
Low morning sun is welcome until it is in your eyes.		at most 45 0-100 scalereasoning/intents
For morning coffee, wind must be at most 3.5m/s.
Cold air moving early is what sends people back inside.		at most 3.5 m/sreasoning/intents
For morning coffee, wetness must be at most 40 on the reporting scale.
Dew is the actual reason the morning chair is unusable, not temperature.		at most 40 0-100 scalereasoning/intents
For morning coffee, privacy must be at most 55 on the reporting scale.
Early is when people are least dressed for an audience.		at most 55 0-100 scalereasoning/intents
For reading for an hour, felt must be at most 26C.
An hour is long enough for a few degrees to matter.		at most 26 Creasoning/intents
For reading for an hour, glare must be at most 18 on the reporting scale.
Glare on a page is the whole problem; heat is secondary.		at most 18 0-100 scalereasoning/intents
For reading for an hour, wind must be at most 3m/s.
Wind turns pages you did not ask it to.		at most 3 m/sreasoning/intents
For reading for an hour, privacy must be at most 45 on the reporting scale.
Settling in takes not feeling observed.		at most 45 0-100 scalereasoning/intents
For reading for an hour, noise must be at most 50 on the reporting scale.
Reading is the use most sensitive to intermittent noise.		at most 50 0-100 scalereasoning/intents
For having people over, felt must be at most 30C.
People generate their own warmth and move to where it works.		at most 30 Creasoning/intents
For having people over, glare must be at most 40 on the reporting scale.
Guests can turn their chairs; a host should still know where the sun lands.		at most 40 0-100 scalereasoning/intents
For having people over, wind must be at most 5m/s.
Wind is the thing that quietly ends an outdoor party.		at most 5 m/sreasoning/intents
For having people over, privacy must be at most 65 on the reporting scale.
A crowd cares less about being seen than one person does.		at most 65 0-100 scalereasoning/intents
For having people over, nightLight must be at most 60 on the reporting scale.
After dark the lighting decides whether people stay outside or drift in.		at most 60 0-100 scalereasoning/intents
For sitting out after dark, felt must be at most 27C.
Radiant heat held by paving is what makes an evening terrace work at all.		at most 27 Creasoning/intents
For sitting out after dark, nightLight must be at most 45 on the reporting scale.
Being the brightest thing in the garden is the same as being on stage.		at most 45 0-100 scalereasoning/intents
For sitting out after dark, privacy must be at most 50 on the reporting scale.
Daytime privacy and night privacy are different problems in the same place.		at most 50 0-100 scalereasoning/intents
For sitting out after dark, wind must be at most 3.5m/s.
Evening air movement is felt more sharply than the same wind at noon.		at most 3.5 m/sreasoning/intents
For working outside, felt must be at most 27C.
Two hours in the sun with a laptop is not work, it is endurance.		at most 27 Creasoning/intents
For working outside, glare must be at most 14 on the reporting scale.
A screen is unreadable long before a page is.		at most 14 0-100 scalereasoning/intents
For working outside, directSun must be at most 55 on the reporting scale.
Direct sun on a screen defeats every brightness setting there is.		at most 55 0-100 scalereasoning/intents
For working outside, wind must be at most 4m/s.
Paper moves; so does a light laptop.		at most 4 m/sreasoning/intents
For working outside, noise must be at most 55 on the reporting scale.
Calls are the first thing an outdoor desk loses.		at most 55 0-100 scalereasoning/intents
For children playing, felt must be at most 28C.
Children overheat faster than the adults watching them.		at most 28 Creasoning/intents
For children playing, surfaceHeat must be at most 45C.
Bare feet meet the paving long before anybody checks a thermometer.		at most 45 Creasoning/intents
For children playing, directSun must be at most 70 on the reporting scale.
Some shade to retreat into matters more than shade everywhere.		at most 70 0-100 scalereasoning/intents
For children playing, wetness must be at most 55 on the reporting scale.
Wet ground decides what they can do out there.		at most 55 0-100 scalereasoning/intents
For the dog, surfaceHeat must be at most 42C.
Paw pads burn on surfaces people walk over in shoes without noticing.		at most 42 Creasoning/intents
For the dog, directSun must be at most 60 on the reporting scale.
A dog needs somewhere to move to, not a uniformly shaded yard.		at most 60 0-100 scalereasoning/intents
For the dog, felt must be at most 26C.
Dogs shed heat far less efficiently than we do.		at most 26 Creasoning/intents
For growing things, light must be at least 6 mol/m2/day.
Plants respond to the light that actually arrives over a day, not to the label on the tag. Below about six moles a day, very little thrives rather than merely surviving.		at least 6 mol/m2/dayreasoning/intents
For growing things, sunHours must be at least 1.5h.
Some direct sun, even briefly, changes what is possible here.		at least 1.5 hreasoning/intents
For growing things, dryingTime must be at most 10h.
Roots and foliage sitting wet kill more plants than the wrong hardiness zone does.		at most 10 hreasoning/intents
For growing things, heatHours must be at most 5h.
Reflected heat off a wall or paving cooks a container from the outside in.		at most 5 hreasoning/intents
For leaving things out, uvDose must be at most 1.1 MJ/m2/day.
Ultraviolet dose is cumulative and does not care whether anyone is sitting there.		at most 1.1 MJ/m2/dayreasoning/intents
For leaving things out, dryingTime must be at most 12h.
Repeated wetting with slow drying is what actually destroys outdoor things, far more than rainfall totals.		at most 12 hreasoning/intents
For leaving things out, heatHours must be at most 5h.
Heat cycling opens joints, lifts finishes and warps boards.		at most 5 hreasoning/intents
For leaving things out, freezeThaw must be at most 70 cycles/year.
Water getting into something and then freezing is what cracks pots, lifts pavers and splits timber.		at most 70 cycles/yearreasoning/intents
For crossing barefoot, surfaceHeat must be at most 49C.
This is the one use where the ground decides everything and the air decides nothing. Skin blanches at about fifty degrees and burns not far above it, and a pale-looking paver in July sails past both.		at most 49 Creasoning/intents
For crossing barefoot, directSun must be at most 85 on the reporting scale.
Sun on the crossing is only a problem because of what it has done to the slab for the last four hours.		at most 85 0-100 scalereasoning/intents
For crossing barefoot, wetness must be at most 70 on the reporting scale.
Wet stone is cooler and more slippery at once, which is a trade rather than a fix.		at most 70 0-100 scalereasoning/intents
For the hot tub after dark, wind must be at most 2.5m/s.
Wet skin above the waterline loses heat by evaporation many times faster than dry skin, so air movement that nobody would notice in a chair is the whole complaint here.		at most 2.5 m/sreasoning/intents
For the hot tub after dark, privacy must be at most 30 on the reporting scale.
People are least clothed and most lit at the same moment, which is why this fails on sightline far more often than on temperature.		at most 30 0-100 scalereasoning/intents
For the hot tub after dark, nightLight must be at most 35 on the reporting scale.
Any lamp near the water makes the tub the brightest object in the garden and everything beyond it invisible.		at most 35 0-100 scalereasoning/intents
For the hot tub after dark, felt must be at most 24C.
The water handles the body; the air only has to be survivable between the house and the tub.		at most 24 Creasoning/intents
For getting across safely, wetness must be at most 35 on the reporting scale.
Wet paving in permanent shade is the failure here, and it is a different failure from wet paving that dries by nine. A surface that never dries grows the film that actually causes the fall.		at most 35 0-100 scalereasoning/intents
For getting across safely, nightLight must be at least 25 on the reporting scale.
The route has to be lit where the footing changes, not lit generally. Until exterior lights are on the plan this stays unanswered rather than assumed fine.		at least 25 0-100 scalereasoning/intents
For getting across safely, glare must be at most 35 on the reporting scale.
Low sun straight down a path removes the shadows that tell you where the edge is, which is why the same route is fine at noon and treacherous at six.		at most 35 0-100 scalereasoning/intents
For getting across safely, surfaceHeat must be at most 52C.
Anyone who moves slowly across it is on it for longer than anyone who does not.		at most 52 Creasoning/intents
For sleeping out, nightLight must be at most 18 on the reporting scale.
One security floodlight or one neighbour's window is the whole answer. This is the use with the least tolerance for stray light of anything the product models.		at most 18 0-100 scalereasoning/intents
For sleeping out, felt must be at most 24C.
Eight motionless hours forgive nothing. A seat that is pleasant for dinner at nineteen degrees is cold by three in the morning.		at most 24 Creasoning/intents
For sleeping out, wetness must be at most 30 on the reporting scale.
Dew, not rain, is what soaks bedding on a clear night — and a spot with a wide open sky gets the most of it, which is the opposite of what people expect.		at most 30 0-100 scalereasoning/intents
For sleeping out, wind must be at most 2.5m/s.
Air moving over bedding all night removes heat you cannot replace by sitting up.		at most 2.5 m/sreasoning/intents
For sleeping out, privacy must be at most 30 on the reporting scale.
Sleeping is the least guarded thing anybody does outdoors.		at most 30 0-100 scalereasoning/intents
For sleeping out, noise must be at most 45 on the reporting scale.
Intermittent noise wakes people that steady noise does not, which is why a quiet average tells you nothing here.		at most 45 0-100 scalereasoning/intents
For cooking outside, wind must be at most 3.5m/s.
Wind is the whole argument here and it cuts both ways: still air parks smoke on the guests, and moving air throws heat, ash and flame sideways. Where the grill sits relative to the doors is a decision, not a detail. Clearance from the house, from anything overhead and from anything combustible is a code question for somebody who can see the site.		at most 3.5 m/sreasoning/intents
For cooking outside, felt must be at most 24C.
You are already standing next to a heat source. The air only has to be cooler than you are.		at most 24 Creasoning/intents
For cooking outside, glare must be at most 30 on the reporting scale.
You cannot judge a piece of meat you cannot see, and the west sun at six is exactly at eye height.		at most 30 0-100 scalereasoning/intents
For cooking outside, directSun must be at most 70 on the reporting scale.
Full sun on the cook is added on top of the fire, not instead of it.		at most 70 0-100 scalereasoning/intents
For cooking outside, wetness must be at most 55 on the reporting scale.
Somewhere to put a plate down that is not wet is most of what a cook wants from a surface.		at most 55 0-100 scalereasoning/intents
For drying the washing, dryingTime must be at most 6h.
This is the answer, and it is not the same question as whether it rained. Evaporation is run against the radiation and air that actually reach that spot, which is why a line in the lee of a north wall can still be wet at six on a dry day. A spot that keeps catching you out is one you stop trusting, whatever it does on a good afternoon.		at most 6 hreasoning/intents
For drying the washing, sunHours must be at least 2.5h.
Direct sun does the last of the drying and most of the smell.		at least 2.5 hreasoning/intents
For drying the washing, uvDose must be at most 1.4 MJ/m2/day.
The same ultraviolet that brightens white cotton takes the colour out of everything else.		at most 1.4 MJ/m2/dayreasoning/intents

Sources

What leaves this device

A place you map, its photographs, your observations and every change you try are stored on this device and nowhere else. They are never uploaded.

Three things do travel, and it is fairer to list them than to promise nothing does. Searching for a town sends what you typed to Open-Meteo, and the weather for a place is asked for with its coordinates rounded to about a kilometre. The reference library is read by this site's own server, so no database is contacted from your browser. And page visits are counted with Vercel Web Analytics on this same site: no cookies, and a saved place's address in this site, any search terms and anything after a # are removed before the count is sent.

Where this stops

Structure, footings, wind and snow loading, drainage, electrical work, planning consent and boundary law are all outside this. When a change touches one of them the product names it rather than guessing, because the failure mode of guessing there is somebody's pergola in somebody's window.

Naming a boundary and stopping there is half a sentence, though. Every document ends with the other half: who to ask, the questions this property's own geometry raises, what to have in your hand when you go, and where the register is published so a name can be checked. It routes; it never says what the answer will be.

Map a place