Juan Santamaría Intl. Airport (921m)





Number of days available for climatic review

ParameterJanFebMarAprMayJun
Tmax872814908856826847
Tmin715679722698683700
Duration of sunshine155169155120155120
Precipitation171147173165168166
Humidity/Visibility10495112112110112


ParameterJulAugSepOctNovDec
Tmax872862840953906861
Tmin728719714820790725
Duration of sunshine217186210217180124
Precipitation185187199211207185
Humidity/Visibility127122125138130121


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.