Weather & Environment calculators
Interpret weather conditions, sunlight, moisture, and environmental measurements.
Tool map
What are you trying to work out?
Temperature & humidity
6Heat, cold, humidity, dew point, and comfort.
Dew Point Calculator · Gardening Frost Date Calculator · Heat Index Calculator
Sun & weather
1Daylight, weather observations, and atmospheric conditions.
Daylight Hours Calculator
More weather tools
5Additional weather and environmental estimates.
Evaporation Rate Calculator · Plant Light Requirements Calculator · Solar Panel Angle Calculator
A useful place to start
Choose the measured condition first, then confirm the units and location assumptions used by the tool.
Dew Point Calculator
Calculate dew point from air temperature and relative humidity, with condensation, comfort, weather, and building-moisture guidance.
Daylight Hours Calculator
Calculate approximate daylight duration, local solar sunrise, sunset, and solar noon from latitude and date, including polar day and polar night cases.
Gardening Frost Date Calculator
Plan planting windows from average last spring frost, first fall frost, USDA hardiness zone, and crop sensitivity, including frost-free days and crop schedules.
Wind Chill Calculator
Calculate the NWS wind-chill temperature from air temperature and wind speed within the equation's official applicability thresholds.
Evaporation Rate Calculator
Estimate open-water evaporation from air temperature, water temperature, humidity, wind speed, and surface area, with volume and depth-loss context.
Heat Index Calculator
Calculate the NWS heat index from air temperature and relative humidity, including the official branch decision and humidity adjustments.
Plant Growth Calculator
Calculate daily and cumulative growing degree days from temperatures and a base you enter.
Plant Light Requirements Calculator
Calculate daily light integral from measured PPFD and photoperiod.