WebToolArcWeather & Atmosphere Tools
Free browser-based weather & atmosphere tools with instant results and no account required.
Sunrise Sunset Calculator
Estimate sunrise, sunset, civil twilight, solar noon, and day length for a date and location.
Weather & Atmosphere ToolsHeat Index Calculator
Calculate the U.S. National Weather Service heat index from air temperature and relative humidity.
Weather & Atmosphere ToolsWind Chill Calculator
Calculate the U.S. National Weather Service wind chill from air temperature and wind speed.
Weather & Atmosphere ToolsDew Point Calculator
Calculate dew point from air temperature and relative humidity using a Magnus approximation.
Weather & Atmosphere ToolsRelative Humidity Calculator
Calculate relative humidity from air temperature and dew point.
Weather & Atmosphere ToolsWet Bulb Temperature Calculator
Estimate psychrometric wet-bulb temperature from dry-bulb temperature, relative humidity, and station pressure.
Weather & Atmosphere ToolsVapor Pressure Calculator
Calculate saturation and actual water-vapor pressure from temperature, dew point, or relative humidity.
Weather & Atmosphere ToolsMixing Ratio Calculator
Calculate atmospheric water-vapor mixing ratio from temperature, relative humidity, and station pressure.
Weather & Atmosphere ToolsAbsolute Humidity Calculator
Calculate absolute humidity from air temperature and relative humidity.
Weather & Atmosphere ToolsHumidex Calculator
Calculate the Environment and Climate Change Canada Humidex from temperature and humidity.
Weather & Atmosphere ToolsApparent Temperature Calculator
Estimate shade-based apparent temperature from air temperature, humidity, and wind speed.
Weather & Atmosphere ToolsRainfall Volume Calculator
Convert rainfall depth over an area into total water volume.
Weather & Atmosphere ToolsSnow Water Equivalent Calculator
Estimate liquid-water equivalent from snow depth and a user-selected snow-to-liquid ratio.
Weather & Atmosphere ToolsBeaufort Scale Calculator
Convert wind speed to a Beaufort force number and descriptive category.
Weather & Atmosphere ToolsWind Power Density Calculator
Calculate ideal wind power density from air density and wind speed.
Weather & Atmosphere ToolsAir Density Calculator
Calculate moist-air density from temperature, pressure, and relative humidity.
Weather & Atmosphere ToolsSea Level Pressure Calculator
Estimate sea-level pressure from station pressure, elevation, and air temperature.