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North America

High Level Airport (338m)





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax185168184180185180
Tmin185169186180186179
Duration of sunshine208190197199241234
Precipitation186168187181186180
Humidity/Visibility184167184178184178


ParameterJulAugSepOctNovDec
Tmax179186207211208215
Tmin184188209212206216
Duration of sunshine244243268209230245
Precipitation186190210215210217
Humidity/Visibility183182207210206215


Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured.

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