Weather & Environment tool map
Temperature & humidity
Heat, cold, humidity, dew point, and comfort.
Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.
Dew Point Calculator
Calculate dew point from air temperature and relative humidity, with condensation, comfort, weather, and building-moisture guidance.
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.
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.
Relative Humidity Calculator
Calculate relative humidity from air temperature and dew point with the Magnus-Tetens formula, plus comfort, condensation, and mold-risk guidance.
Wind Chill Calculator
Calculate the NWS wind-chill temperature from air temperature and wind speed within the equation's official applicability thresholds.