Weather Index Calculator
Calculate wind chill, heat index or dew point from temperature and humidity or wind speed.
Assumptions used in this calculation
- Formula validity ranges: Wind chill (Environment Canada) is intended for temperatures at or below 10°C with wind above ~4.8 km/h; heat index (Rothfusz regression) is intended for temperatures above ~27°C with meaningful humidity. Results outside these ranges are extrapolated and less reliable.
- Standard measurement height: Temperature and wind speed are assumed to be measured at standard outdoor conditions (roughly 1.5 m above ground, in the shade); readings from a car dashboard or a sunny thermometer will differ.
About this calculator
The weather index calculator computes wind chill, heat index or dew point, the three most common 'feels like' and moisture indices used in weather forecasting.
Worked example
-10°C at 20 km/h wind
Result: -17.9°C wind chill
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