The rainy season starts in October and continues through May. Between December and February, almost 70% of annual rainfall occurs, while 20% of annual rainfall occurs in October and November. Rain in June and September is rare and comes to negligible amounts. July and August have no rain at all, except for one rainfall of 1.5 millimeters (0.059 in) on July 10, 1995 in Tulkarem City (Tulkarm Agricultural Department). The mean annual rainfall in the city of Tulkarem is 642 millimeters (25.3 in) for the period from 1952 to 1995 (Tulkarem Agricultural Department).