Wind Chill Calculator
This wind chill calculator gives the feels-like temperature in wind. At −5 °C with a 25 km/h wind it feels like −12.3 °C; at 32 °C and 60% humidity, the heat index is 37.1 °C.
Example: What do you want to calculate: Wind chill (cold and wind) · Temperature unit: Degrees Celsius (°C) · Air temperature -5 · Wind speed 25 · Wind unit: km/h → Feels-like temperature: Feels-like temperature (wind chill): -12.3 °C. Source: US National Weather Service – Wind Chill Temperature Index (JAG/TI, 2001). Updated: .
How it is calculated
How to calculate wind chill
Wind carries heat away from the skin, so cold air with wind feels colder. The wind chill index (JAG/TI, 2001) computes it as 13.12 + 0.6215 × T − 11.37 × v⁰·¹⁶ + 0.3965 × T × v⁰·¹⁶ with air temperature T in °C and wind v in km/h. It applies up to 10 °C and from 4.8 km/h.
Heat index in warm weather
In heat, high humidity acts like extra warmth because sweat evaporates less easily. The US National Weather Service heat index (Rothfusz regression) applies from about 27 °C and 40% humidity. 32 °C at 60% feels like 37 °C.
Feels-like is not measured
The feels-like temperature says nothing about the actual air temperature. A thermometer still shows the measured temperature; water does not freeze earlier in wind. The value only describes how fast bare skin cools.
Honest limits
Sun, clothing, body build and gusts strongly affect how you feel. The calculator gives no health advice. The values come from formulas for a standard situation.
Frequently asked questions
How do you calculate wind chill?
With 13.12 + 0.6215 T − 11.37 v⁰·¹⁶ + 0.3965 T v⁰·¹⁶ (T in °C, v in km/h). The calculator applies it and converts units.
How cold does −5 °C feel with a 25 km/h wind?
About −12.3 °C. The wind lowers the feels-like temperature here by roughly 7 degrees.
When does the wind chill formula apply?
At 10 °C or below with wind of at least 4.8 km/h. In warmer air or calm conditions the formula is not valid.
What is the heat index?
The feels-like temperature for warmth and humidity. It applies from about 27 °C and 40% humidity.
Does water freeze because of wind chill below 0 °C?
No. Wind chill does not change the air temperature. An object cools at most to the air temperature.
Sources and legal basis
- US National Weather Service – Wind Chill Temperature Index (JAG/TI, 2001)
- US National Weather Service – The Heat Index Equation (Rothfusz regression)
- Wikipedia – Wind chill
As of: · Editorial policy
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