World

North America

Seattle (137m)





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax208818962092203120852033
Tmin208219022104203020822032
Duration of sunshine93869390155180
Precipitation186170187182186180
Humidity/Visibility177160175170174170


ParameterJulAugSepOctNovDec
Tmax209820972057211720642125
Tmin210320992053212020672131
Duration of sunshine1861551501249093
Precipitation188190210206210218
Humidity/Visibility171176195192195213


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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