Calayan





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax155140155150155150
Tmin170145155156159169
Duration of sunshine000000
Precipitation625762607185
Humidity/Visibility7203412


ParameterJulAugSepOctNovDec
Tmax156155150155150155
Tmin183170150163163160
Duration of sunshine000000
Precipitation909489819093
Humidity/Visibility181617141310


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.