On the great and abrupt falls of air temperature in Athens

Summary This note deals with the great and abrupt falls of air temperature in Athens which occur especially during the cold season of the year. The frequency of these falls, the greatest falls noted per month and the weather situations associated with these falls are examined separately. It was found that the weather situations which cause the great falls of air temperature in Greece can be classified in four categories:A, B, C andD. In theA belong the anticyclones of N and NW Europe both moving and not. TheB comprises the extensions of the anticyclone of the Azorez over Europe. In theC belong the extension of the Russian anticyclones and theD comprises the cold fronts of depressions moving from W to E.