Except in the central highlands, the climate is warm and humid. Average humidity in Managua in June, the most humid month, is 84%; in April, the driest month, 62%. The mean temperature, varying according to altitude, is between 20° and 30° C (68° and 86° F ). In Managua, monthly average temperatures range from a minimum of 23° C (73° F ) and a maximum of 30° C (86° F ) in January to a minimum of 26° C (79° F ) and a maximum of 31° C (88° F ) in July. There are two seasons: a wet season, from May to December, and a dry season, from January through April. Rainfall, however, varies according to region, and the rainy season in the eastern area may extend 9 or even 12 months. Average annual rainfall along the Mosquito Coast reaches 254–635 cm (100–250 in) as a result of the easterly trade winds blowing in from the Caribbean; the highlands also have heavy rainfall. Managua receives 114 cm (45 in), while the Pacific coast averages over 102 cm (40 in) a year.