Guam's climate is characterized as tropical marine moderated by seasonal northeast trade winds. The weather is generally very warm and humid with little seasonal temperature variation. The mean high temperature is 86 °F (30 °C) and mean low is 76 °F (24 °C) with an average annual rainfall of 96 inches (2,180 mm). The dry season runs from December to June. The remaining months (July to November) constitute the rainy season. The months of January and February are considered the coolest months of the year with overnight low temperatures of 70–75 °F (21–24 °C) and low humidity levels. The highest temperature ever recorded in Guam was 96 °F (36 °C) on April 18, 1971 and April 1, 1990, and the lowest temperature ever recorded was 65 °F (18 °C) on February 8, 1973.