World

North America

Toronto/Pearson AP (173m)





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax834753832806832808
Tmin835752831805836806
Duration of sunshine239215206231276229
Precipitation186169187181186180
Humidity/Visibility184165182176183176


ParameterJulAugSepOctNovDec
Tmax830835836863838864
Tmin836833835865837867
Duration of sunshine276273326298291302
Precipitation187190210215211217
Humidity/Visibility182183203208204213


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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