New Hampshire Climate
New Hampshire experiences a humid continental climate, with warm, humid summers, cold, wet winters, and uniform precipitation all year. The climate of the southeastern portion is moderated by the Atlantic Ocean and averages relatively milder and wetter weather, while the northern and interior portions experience cooler temperatures and lower humidity. Winters are cold and snowy throughout the state, and especially severe in the northern and mountainous areas. Average annual snowfall ranges from 60 inches to over 100 inches across the state.
During autumn, the leaves on many hardwood trees in New Hampshire turn colors, attracting many tourists.
Average daytime highs are in the mid 70°s F to low 80°s F (24–28 ° C) throughout the state in July, with overnight lows in the mid 50°s F to low 60°s F (13–15 °C). January temperatures range from an average high of 34° F (1° C) on the coast to overnight lows below 0° F (−18 ° C) in the far north and at high elevations. Average annual precipitation statewide is roughly 40 inches with some variation occurring in the White Mountains due to differences in elevation and annual snowfall. New Hampshire’s highest recorded temperature was 106 ° F (41° C) in Nashua on July 4, 1911, while the lowest recorded temperature was −47 ° F (−44° C) at the summit of Mount Washington on January 29, 1934. Mount Washington also saw an unofficial −50° F (−46° C) reading on January 22, 1885, which, if made official, would tie the all-time record low for New England (also −50° F (−46° C) at Big Black River, Maine on January 16, 2009, and Bloomfield, Vermont on December 30, 1933).
Extreme snow is often associated with a northeaster, such as the blizzard of 1978 and the blizzard of 1993, when several feet accumulated across portions of the state over 24 to 48 hours. Lighter snowfalls of several inches occur frequently throughout winter, often associated with an Alberta Clipper.
New Hampshire, on occasion, is affected by hurricanes and tropical storms although by the time they reach the state they are often no longer tropical, with most storms striking the southern New England coastline and moving inland or passing by offshore in the Gulf of Maine. Most of New Hampshire averages fewer than 20 days of thunderstorms per year and an average of two tornadoes occur annually statewide.