Monde

Europe

Northolt





Number of days available for climatic review

Paramètrejanfevmaravrmaijuin
Tmax620560620600620600
Tmin620560620600620600
Durée d’insolation000000
Précipitation341308341330341330
Humidité/Visibilité-7964913731001569762-1983228992000


Paramètrejuilletaoûtsepoctnovdéc
Tmax620620600620600620
Tmin620620600620600620
Durée d’insolation000000
Précipitation341341330341330341
Humidité/Visibilité00-21381470880-19834569960


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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