The climate has marked seasonal variations influenced by both the Mediterranean Sea and the desert. Along the Tripolitanian coast, summer temperatures reach between 40 and 46° C (104– 115° F ); farther south, temperatures are even higher. Summers in the north of Cyrenaica range from 27 to 32° C (81–90° F ). In Tobruk (Tubruq), the average January temperature is 13° C (55° F ); July, 26° C (79° F ). The ghibli, a hot, dry desert wind, can change temperatures by 17–22° C (30–40° F ) in both summer and winter.
Rainfall varies from region to region. Rain falls generally in a short winter period and frequently causes floods. Evaporation is high, and severe droughts are common. The Jabal Akhdar region of Cyrenaica receives a yearly average of 40 to 60 cm (16–24 in). Other regions have less than 20 cm (8 in), and the Sahara has less than 5 cm (2 in) a year.