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7 ˚C) to say how comfortable one feels at certain temperatures and wind speeds
whilst wearing appropriate clothing. These conditions are a temperature below 33 °C
and a wind speed higher than 2.6 m/s. Wind chill is defined as the cooling effect of
uncovered skin at an assumed constant 33 °C skin surface temperature.
The higher the wind speed is and the lower the actual temperature, the more
noticeable is the wind chill effect.
The "perceived temperature" is roughly comparable to the so-called felt tempera-
ture, which additionally takes into account the radiation effect of the sun, light re-
fection from the clouds, the light wavelength, etc.
Wind strength table (Beaufort)
Beaufort Wind speed Description
0 0 - 0.7 km/h calm
1 0.7 - 5.4 km/h slight breeze
2 5.5 - 11.9 km/h light breeze
3 12.0 - 19.4 km/h weak breeze
4 19.5 - 28.5 km/h moderate breeze
5 28.6 - 38.7 km/h fresh breeze
6 38.8 - 49.8 km/h strong wind
7 49.9 - 61.7 km/h stiff wind
8 61.8 - 74.6 km/h stormy wind
9 74.7 - 88.9 km/h storm
10 89.0 - 102.4 km/h heavy storm
11 102.5 - 117.4 km/h near hurricane storm
12 > 117.4 km/h hurricane
The Comfort Indicator (☺) represents the climatic conditions, for which the
following table is used (the symbol status shows the area of validity):
Temperature Humidity
20% 30% 35% 40% 45% 50% 55% 60% 65% 70%
< 18°   
18-19.9°   
20-21.9°  ☺ ☺☺
22-23.9°  ☺☺ ☺
24-25.9°  ☺☺ 
26-27.9°   
over 28°   
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