User Manual

Windchill (equivalent temperature, perceived temperature)

Under certain conditions, men perceive temperatures totally different than shown by a thermom-

eter. At low temperatures, we perceive the temperature at our naked skin the lower the more

rapidly an additional wind blows.

The windchill is deﬁned as a cooling effect for naked skin having a theoretical surface temperature

of 33°C and at a wind speed of more than 2.6m/s.

The higher the wind speed and the lower the actual ambient temperature, the more perceptible

is the windchill effect.

The ”perceived temperature” can almost be compared to the so called felt temperature which

additionally considers such effects as the radiation of sunlight, the luminous reﬂectance of the

clouds, the light wave length etc..

Wind speed table (Beaufort)

Beaufort Wind speed Designation

0 0 – 0.7km/h calm

1 0.7 – 5.4km/h very soft breeze

2 5.5 – 11.9km/h light breeze

3 12.0 – 19.4km/h weak breeze

4 19.5 – 28.5km/h moderate breeze

5 28.6 – 38.7km/h fresh breeze

6 38.8 – 49.8km/h strong wind

7 49.9 – 61.7km/h stiff wind

8 61.8 – 74.6km/h stormy wind

9 74.7 – 88.9km/h storm

10 89.0 – 102.4km/h heavy storm

11 102.5 – 117.4km/h violent storm

12 > 117.4km/h hurricane