Wind Chill Calculator

Wind makes cold feel colder — find the wind chill 'feels like' temperature.

How the Math Works

The Wind Chill Calculator uses the National Weather Service (NWS) formula to estimate the 'feels like' temperature. The formula combines air temperature (T) and wind speed (V) to calculate perceived temperature: 35.74 + 0.6215*T - 35.75*(V^0.16) + 0.4275*T*(V^0.16). This equation accounts for how wind accelerates heat loss from the body, making it feel colder than the actual air temperature. The result is valid only for temperatures below 50°F and wind speeds over 3 mph.

Practical Applications

To use this calculator, input the current air temperature and wind speed into the formula. For example, if the air temperature is 30°F and wind speed is 20 mph, plugging these values into the NWS formula gives a wind chill of approximately 17°F. This helps individuals plan activities by determining if conditions are safe for outdoor tasks, such as construction work, sports, or commuting, and whether additional precautions like windproof clothing are necessary to prevent hypothermia or frostbite.

Day-to-Day Use

In daily life, calculating wind chill helps people dress appropriately for cold weather. Knowing the 'feels like' temperature allows you to layer clothing effectively, protect extremities, or postpone outdoor activities if conditions are dangerous. For instance, a 40°F day with strong winds might feel like 30°F, prompting you to wear a heavy coat. It also aids in understanding weather forecasts and making informed decisions, such as adjusting travel routes or ensuring pets and plants are sheltered from freezing conditions.

Worked example

20 °F at 15 mph → ~6 °F.

FAQ