The climate in southern Greece and on the islands is Mediterranean, with hot, dry summers and cool, wet winters. Winters are severe in the northern mountain regions. The summer heat is moderated by mountain and sea breezes. Precipitation is heaviest in the north and in the mountains. Average annual rainfall varies from 50 to 121 cm (20–48 in) in the north and from 38 to 81 cm (15–32 in) in the south. The mean temperature of Athens is 17° C (63° F ), ranging from a low of 2° C (36° F ) in the winter to a high of 37° C (99° F ) in the summer.