Monde

Amérique du Nord

San Francisco (Aéroport)





Number of days available for climatic review

Paramètrejanfevmaravrmaijuin
Tmax215219552162209521502095
Tmin216419572165209221532097
Durée d’insolation000000
Précipitation186169187181186180
Humidité/Visibilité184166184176179176


Paramètrejuilletaoûtsepoctnovdéc
Tmax216421652118218321222195
Tmin216621602125218121282193
Durée d’insolation000000
Précipitation188190210206210217
Humidité/Visibilité182182202198203213


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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