Skip to content
OverCalculator
Theme

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.

Latest update:

These tools describe how hot or cold conditions actually feel and what the numbers mean for comfort, condensation, and gardening. Start with the heat index calculator, which converts air temperature and humidity into the feels-like temperature on hot days, and pair it with the wind chill calculator for cold, windy conditions. Use the dew point calculator to judge humidity from air temperature and relative humidity, including condensation and comfort guidance. If you garden, the frost date calculator turns average frost dates and hardiness zone into planting windows. Find related sun, rain, and wind tools in the Weather & Environment collection.

7 of 7 calculators

Temperature & humidity7 calculators

Dew Point Calculator

Perform a dew point calculation from air temperature and relative humidity, with condensation, comfort, weather, and building-moisture guidance.

Updated

Verified

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.

Updated

Verified

Heat Index Calculator

Calculate the NWS heat index — the feels like temperature — from air temperature and relative humidity or dew point, including the official branch decision and humidity adjustments.

Updated

Verified

Humidex Calculator

Calculate the humidex from air temperature and dew point with the Environment Canada formula, and read the comfort category from little discomfort to dangerous.

Updated

Verified

Plant Growth Calculator

Calculate daily and cumulative growing degree days from temperatures and a base you enter.

Updated

Verified

Relative Humidity Calculator: From Temperature & Dew Point

Calculate relative humidity from air temperature and dew point with the Magnus-Tetens formula, plus comfort ranges, condensation, and mold-risk guidance.

Updated

Verified

Wind Chill Factor Calculator

Calculate the wind chill factor — the NWS wind-chill temperature — from air temperature and wind speed within the equation's official applicability thresholds.

Updated

Verified

Frequently asked questions

What does dew point tell me?
Dew point tells you the temperature at which the current air would become saturated if cooled at constant moisture. It is a strong indicator of actual water vapor content, so it often explains muggy weather, overnight dew, window condensation, and how much cooling a dehumidifier must overcome.
How is dew point different from relative humidity?
Relative humidity changes whenever temperature changes because it compares current moisture with the air's saturation capacity. Dew point is tied more directly to the amount of water vapor present. A warm afternoon and cool morning can have very different relative humidity but nearly the same dew point.
What dew point feels comfortable outdoors?
Many people find dew points below about 55 degrees Fahrenheit comfortable, the 60s increasingly humid, and the 70s oppressive, though acclimation, wind, sun, and activity matter. The calculator does not assign comfort categories, but the dew point can be paired with heat index for hot-weather safety decisions.

More in Weather & Environment

Sun & weatherMore weather tools

Related topics

The same topic in other collections.

Temperature & pressureExercise & fitness

Related comparisons

All Weather & Environment comparisons →
Dew Point vs Evaporation Rate CalculatorCompare dew point and evaporation rate: one measures the actual water vapor content of the air, the other estimates how fast open water is lost — and how the vapor pressure deficit links them.Dew Point vs HumidexCompare the dew point, a direct measure of moisture in the air, with the humidex, Canada's heat-stress index that combines temperature and humidity into a feels-like number.Dew Point vs Relative Humidity CalculatorCompare the dew point and relative humidity calculators: two moisture measures of the same air, computed from different inputs, and when to use which.Evaporation Rate vs Relative Humidity CalculatorCompare the evaporation rate calculator and the relative humidity calculator: one estimates open-water loss from temperature, humidity, wind, and area; the other reports how close the air is to saturation from temperature and dew point.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.Frost Date vs Plant Growth CalculatorCompare the gardening frost date calculator with the plant growth calculator: calendar-based planting windows versus accumulated growing degree days.Frost Date vs Plant Light CalculatorCompare the gardening frost date and plant light calculators: one plans when to start seeds and plant outdoors, the other measures whether seedlings get enough daily light.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.Heat Index vs Dew Point CalculatorCompare heat index and dew point: one reports actual moisture content, the other how hot humid air feels — and when to use each.Heat Index vs Humidex CalculatorCompare the U.S. NWS heat index and the Canadian humidex: two heat-stress apparent temperatures that combine air temperature with humidity, and how to pick the right one.Heat Index vs Wind Chill CalculatorCompare the NWS heat index and wind chill: two 'feels like' temperatures that answer opposite seasonal questions, and how to pick the right one.Humidex vs Relative HumidityCompare the Canadian humidex heat-discomfort index from air temperature and dew point with the relative humidity percentage from the same two readings, and when to use each.Plant Light Requirements vs Plant GrowthCompare the plant light requirements and plant growth calculators: daily light integral from measured PPFD and photoperiod versus growing degree days accumulated from daily temperatures.Relative Humidity vs Heat IndexChoose between a saturation metric that reports how close the air is to holding all the moisture it can at a temperature, and an NWS apparent temperature that reports how hot humid air feels.Wind Chill vs Dew Point CalculatorCompare wind chill and dew point: one converts temperature and wind into a cold 'feels like' number, the other converts temperature and humidity into the saturation point where surfaces frost or condense.Wind Chill vs HumidexCompare the two apparent-temperature indices: the NWS wind-chill temperature for cold, windy conditions versus the Environment Canada humidex for hot, humid conditions.

← Back to Weather & Environment