The National Weather Service offers a comprehensive 7-day forecast for Boston and its surrounding areas.
The spring and summer months of April through June and the early fall months of September through mid-November are the most enjoyable, temperate seasons. Bostonians experience their coldest months during January and February (with a mean temperature of about 29 degrees) and their warmest months during July and August (with a mean around 72 degrees). Freezing temperatures are common from late November to late March. By May, the temperatures rise to a moderate 60-70 degrees, then reach even higher numbers (sometimes 90 degrees and over) during July and August.
Boston has no true dry season as it rains intermittently throughout the year. Much of the rainfall during the summer and early fall comes from showers and thunderstorms. At other times during the year, low pressure systems pass frequently and produce rain, on average, one out of three days. Coastal storms-which Bostonians refer to as "northeasters" or "nor'easters"- produce much of the rain and snow. The main snow season occurs from December through March.
Because of its moderate coastal weather systems, Boston is not known to suffer from particularly windy weather. Although winds of 30 miles per hour or higher may occur anytime during the year, gales happen more frequently and severely during the winter. While relative humidity has fallen as low as 5%, such dryness is quite rare. Boston does experience heavy fog on average two days a month, which increases at locations nearer to the coast.