Wind chill, heat index, and other weather comfort and safety calculators.
Calculate the wind chill (how cold it actually feels) from the air temperature and wind speed using the official NWS/Environment Canada formula, with a frostbite risk level based on estimated time to frostbite.
Calculate the heat index (how hot it actually feels) from the air temperature and relative humidity using the official NWS Rothfusz regression, with a heat-related illness risk level.
Select the UV index and your skin type (Fitzpatrick scale) to get the WHO UV risk level, an estimated time to sunburn with no protection, and the minimum recommended SPF.
Calculate the dew point from air temperature and relative humidity using the Magnus-Tetens formula, with the associated humidity comfort level.
Convert wind speed to the Beaufort force scale (0-12) and back, with the official descriptive name and observed effects at sea and on land for each force.
Enter the rain probability shown in a weather forecast and the expected precipitation type to get a plain-language interpretation, what the percentage does not mean, and a likely duration if rain occurs.
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