Improving the estimation of the true mean monthly and true mean annual air temperatures in Greece

The true mean monthly/annual air-temperature estimations are usually based on the monthly averages of meteorological observations performed at standard hours. The performance of this combination varies as it depends on local climate of the particular meteorological station; it consequently allows for small/large deviations from its exact value. This study examines the possible deviations in Greece and suggests ways of improving the derived estimates. Two cases are considered. (1) An area has one thermograph and a number of thermometric stations. (2) An area has several thermographs and many thermometric stations. Solutions for minimizing the estimation error in both cases are provided.