Skip to content
OverCalculator
Theme

Weather & Environment tool map

Sun & weather

Daylight, weather observations, and atmospheric conditions.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

Latest update:

These tools connect local sun, rain, and snow conditions to practical plans. Start with the daylight hours calculator, which estimates sunrise, sunset, and day length from latitude and date — useful for scheduling or garden planning. Use the rainwater harvesting calculator to estimate monthly and annual collection from roof area and rainfall, with first-flush caveats. In winter, the roof snow load calculator turns ground snow load and exposure into a flat roof snow load estimate. The UV exposure calculator rates relative UV risk from index, time outdoors, and skin type, with protection guidance. Find related temperature and humidity tools in the Weather & Environment collection.

4 of 4 calculators

Frequently asked questions

What does the daylight-hours estimate include?
It estimates astronomical day length from latitude and date. The result includes total daylight, approximate local solar sunrise, approximate local solar sunset, and solar noon. It does not use longitude, time zone, elevation, local horizon, atmospheric refraction, or daylight saving time.
Why does the calculator only need latitude and date?
Day length is mainly controlled by latitude and Earth's seasonal tilt on a given date. Longitude affects clock time, not the length of daylight. Because this tool reports local solar time, it can estimate duration without asking for a time zone or city.
Can it calculate polar day and polar night?
Yes. If the sun-angle geometry indicates continuous daylight, it returns 24 hours and labels polar day. If the geometry indicates no sunrise, it returns zero hours and labels polar night. The calculation also includes special solstice checks above 66.5 degrees latitude.

More in Weather & Environment

Temperature & humidityMore weather tools

Related comparisons

All Weather & Environment comparisons →
Daylight Hours vs Solar Panel CalculatorCompare the daylight hours and solar panel calculators: one estimates geometric day length from latitude and date, the other turns panel area and specific yield into annual energy scenarios.Evaporation Rate vs Rainwater HarvestingCompare the two outdoor water-volume calculators: open-water loss from temperature, humidity, wind, and surface area versus roof runoff capture from area, rainfall, and collection efficiency.Frost Date vs Daylight Hours CalculatorCompare the gardening frost date calculator with the daylight hours calculator: calendar-based frost windows versus seasonal day length for the same garden.Heat Index Calculator vs UV Exposure CalculatorChoose between the NWS heat index for hot-weather apparent temperature and a UV index-based exposure score for sun exposure planning.Plant Light Requirements vs Daylight HoursCompare the plant light requirements and daylight hours calculators: daily light integral from measured PPFD and photoperiod versus daylight duration from latitude and date.Rainwater Harvesting vs Water DemandCompare the supply side and demand side of household water: how much rain your roof can collect versus how much your household uses, so you can size a rain barrel or cistern against real need.Snow Load vs Roof PitchCompare the roof snow load calculator's ASCE 7 flat-roof estimate with the roof pitch calculator's rise/run geometry — and how they combine for sloped roofs.Solar Panel Angle vs Daylight Hours CalculatorCompare displaying fixed or seasonal panel tilt angles for a scenario with computing daylight duration, solar sunrise, and sunset from latitude and date — and where sun geometry ends and energy estimates begin.UV Exposure vs Daylight Hours CalculatorCompare the two sun-planning tools: a relative UV exposure score from UV index, minutes outdoors, and skin type versus daylight duration, sunrise, and sunset from latitude and date.UV Exposure vs Plant Light CalculatorCompare UV exposure level — UV index, time outdoors, and skin type — with plant light requirements, which convert PPFD and photoperiod into daily light integral for growers.

← Back to Weather & Environment