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Cologne Bonn Airport





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax10159201044101510531019
Tmin10189251044101610541016
Duration of sunshine625449373842
Precipitation527476527510527510
Humidity/Visibility000000


ParameterJulAugSepOctNovDec
Tmax102710241001103610161025
Tmin103510431015103610111025
Duration of sunshine212942443053
Precipitation527527510527510527
Humidity/Visibility000000


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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