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Windchill (equivalent temperature, perceived temperature)
Under certain conditions, men perceive temperatures totally different than shown by a thermometer.
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
0
0 – 0.7km/h
1
0.7 – 5.4km/h
2
5.5 – 11.9km/h
3
12.0 – 19.4km/h
4
19.5 – 28.5km/h
5
28.6 – 38.7km/h
6
38.8 – 49.8km/h
7
49.9 – 61.7km/h
8
61.8 – 74.6km/h
9
74.7 – 88.9km/h
10
89.0 – 102.4km/h
11
102.5 – 117.4km/h
12
> 117.4km/h
76
Designation
calm
very soft breeze
light breeze
weak breeze
moderate breeze
fresh breeze
strong wind
stiff wind
stormy wind
storm
heavy storm
violent storm
hurricane
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