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Northolt





Number of days available for climatic review

ΠαράμετροςΙανΦεβ ΜαρΑπρΙουνΙουλ
Tmax620560620600620600
Tmin620560620600620600
Διάρκεια Ηλιοφάνειας000000
Υετός341308341330341330
Υγρασία/Ορατότητα 148012466083800


ΠαράμετροςΑυγΣεπΟκτΝοεΔεκ(null)
Tmax620620600620600620
Tmin620620600620600620
Διάρκεια Ηλιοφάνειας000000
Υετός341341330341330341
Υγρασία/Ορατότητα 209811928209739528206399368


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.