Weather Calculators

Five calculators for how the air actually feels, each built on a published formula, with the range it is valid for and a reference chart generated from the same code.

• Wet-bulb temperatureThe wet-bulb temperature is the lowest temperature evaporation can cool air to.Heat stress · humidity
• Wind chillWind chill estimates how cold exposed skin feels when wind strips heat away faster than still air would.Cold exposure · NWS 2001 formula
• Heat indexThe heat index combines air temperature and relative humidity into how hot it feels to a person in the shade.Heat stress · NWS method
• Dew pointThe dew point is the temperature air would have to cool to for dew or fog to form.Humidity · Magnus formula
• Feels-like temperatureThe feels-like temperature is the single number forecasts use for how the weather will feel on skin.Apparent temperature · NWS rule

Need to switch units instead? The weather unit converters handle °C and °F, wind speed, rainfall and air pressure. For live conditions, open the forecast, which shows the current feels-like temperature for your location.