The climate is hot and humid during most of the year and is typically equatorial. High temperatures range from 75°F to 82°F in the dry seasons and from 86°F to 93°F in the rainy seasons. Four distinguishable seasons are evident, although they vary somewhat each year: the long dry season from late May until mid-September; the short rainy season from mid-September until mid-December; the short dry season from mid-December through January; and the long rainy season from February until late May. Rainfall in Libreville is about 115 inches a year (the U.S. average is about 40 inches); the largest amounts fall in October, November, March, and April. The humidity is always high. The summer months, as in the southern hemisphere, are the coolest time of the year.