The climate is tropical, with some variation depending on altitude. Port-au-Prince ranges in January from an average minimum of 23° C (73° F ) to an average maximum of 31° C (88° F ); in July, from 25–35° C (77–95° F ). The rainfall pattern is varied, with rain heavier in some of the lowlands and on the northern and eastern slopes of the mountains. Port-au-Prince receives an average annual rainfall of 137 cm (54 in). There are two rainy seasons, April–June and October–November. Haiti is subject to periodic droughts and floods, made more severe by deforestation. Hurricanes are also a menace.