The climate of Bermuda is sub-tropical, despite its geographical location. During the summer and early autumn months (May through October), the average temperature ranges between 75 and 85 degrees Fahrenheit. It is during these months as well that humidity is at its highest--on average, above 85%. During the year, the mean average humidity is 77%.
Bermuda's mild and warm climate can be primarily attributed to the Gulf Stream, which carries warm and humid air from North America to Bermuda. The Gulf Stream facilitates Bermuda's temperate climate, which doesn't dip below 55 degrees or go above 90 degrees. Similarly, the Gulf Stream keeps the waters off the coast of Bermuda warm enough to swim or scuba dive from March through October.
Bermuda doesn't have four distinct seasons but does experience seasonal shifts in temperature. In general, the weather is divided into two "seasons," primarily for tourism purposes. April through October is generally considered the "summer," with the warmest temperatures and greatest amount of tourism. During the "winter" months--December through March--the temperature averages 68 degrees and tourism dips. The off-season provides an opportunity to visit for drastically reduced (20 to 60 percent) vacation prices.
From August through October, Bermuda is also susceptible to hurricanes and tropical storms. However, because the island is outside of the usual hurricane path (from the Caribbean, northward), severe tropical weather is generally rare. The last time the island was hit by a hurricane was in 2003 (with Hurricane Fabian). Meteorological records indicate hurricanes reach Bermuda once every six or seven years.
There aren't any months where the island receives unusual or large amounts of rain; rather, Bermuda is subject to year-round brief, torrential storms. Though annual precipitation records are kept, rainfall can vary widely from year to year and month to month. January, February, July, August and October all average in excess of five inches of rain, while March, April, May and November average under three inches.
