Mont Aigoual : a site with extreme weather conditions
At 1567 metres altitude, the site exemplifies extreme climatic conditions, including :
Wind
Average annual wind speed 40 kilometres an hour ; gusts of a maximum 300 kilometres an hour
Number of days with wind speed over 60 kilometres an hour : 264 a year
Number of days with wind speed over 100 kilometres an hour : 95 a year
Frost
The depth of frost can attain 100 centimetres in 24 hours, and 200 centimetres in 3 days
Temperature variation
The temperature can change 6 ° Centigrade in 30 minutes
Humidity, precipitation and thunder
Number of days of foggy (strato-cumulus clouds carrying
90 % of pollution) : 241 a year
Number of wet days : 164 a year
Average quantity of rain : 2061 millimetres a year
The intensity of rain can reach 60 millimetres an hour
Maximum quantity of rain : 620 millimetres in 24 hours
Number of days of snowfall : 66 a year
Number of days with snow cover : 120 a year
Number of stormy days : 21 a year.
 
 
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