World

North America

Richmond Intl. Airport





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax293326522930284129152831
Tmin294126562941284229192841
Duration of sunshine62576260124150
Precipitation186169187181186180
Humidity/Visibility179160177171173171


ParameterJulAugSepOctNovDec
Tmax293029312869296028702968
Tmin293529362871296528792967
Duration of sunshine155124120936062
Precipitation188190210215210217
Humidity/Visibility171175193201197214


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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