World

United Kingdom

Belfast/Harbour





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax121109122119120119
Tmin123113123119123117
Duration of sunshine000000
Precipitation124113124121124120
Humidity/Visibility175161073500000


ParameterJulAugSepOctNovDec
Tmax12294117121118120
Tmin12294119123120121
Duration of sunshine000000
Precipitation12599120124120124
Humidity/Visibility003407937779888375366402097152


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.