Curacao and the other ABC islands are hot year round. Temperatures seldom exceed 90°F during the day or fall below 80°F at night. Relative humidity averages 70% annually and seldom varies far from that average. The effect of the heat and the humidity, however, is lessened by the almost constant northeast trade winds. The ocean temperature averages 80°F and only varies a few degrees between summer and winter. Rainfall averages only 22 inches annually, most of which falls during the months of November and December, and the islands are below the hurricane belt so that particular danger is absent. Drought-resistant plants, such as cactus, thorn trees and succulents predominate. August, September and October are the warmest months; December, January and February are the coolest.