Though far north from tropical latitudes, Bermuda has a mild, humid, frost-free climate. The annual mean temperature is 70.2°F. Highs in summer rarely top 90°F, and lows in winter rarely drop under the 50's. The lowest temperature ever officially recorded was 44°F. The Gulf Stream, running west and north of the island, is the main reason for the good climate. Average annual rainfall is 57.6 inches, spread evenly throughout the year. The year-round high humidity, averaging more than 75%, makes some days uncomfortably sticky in summer and damp and cold in winter.
January through March tends to be overcast and squally, although when the sun shines it can be like a breezy spring day. April and May are very pleasant. June through August are very hot and very humid. The heat factor (temperature plus humidity) during the hottest summer months can exceed 110°F degrees Fahrenheit. September is the stormy season, although hurricane season officially extends from June through November. Barring hurricanes, October through December are calm, mild, and usually sunny, and are considered by many to be the most pleasant part of the year.
The climate, well-distributed rainfall, and heavy dew promote the luxuriant growth of vegetation of every description, despite the dearth of soil. Palms, Australian and Norfolk Island pines, mangroves, poincianas, casuarinas, and ficus trees, citrus, and some tropical fruit trees grow well in Bermuda. Prolific oleander and hibiscus brighten gardens and lanes everywhere. Sadly, the famous Bermuda cedar trees that for centuries dominated the landscape, and were the islands' pride, were nearly all destroyed by blight in the 1940s. The few remaining native cedars are protected, and some reforestation with blight-resistant stock is underway.