The climate is tropical, but because of the oceanic surroundings, temperature ranges are not considerable. The hottest month is December, and the coldest is July; the mean daily temperature is about 27° C (81° F ). The year is divided into a dry season (May to October) and a wet season (November to April). Rainfall averages 287 cm (113 in) annually, and the average yearly relative humidity is 83%. Although the islands lie outside the normal track of hurricanes, severe storms occurred in 1889, 1966, and 1968. Trade winds from the southeast are fairly constant throughout the dry season.