Climate and monthly weather forecast
New Hampshire, USA

Flag of New Hampshire, USA
Flag of New Hampshire, USA

The climate of New Hampshire

New Hampshire has a humid continental climate (Köppen climate classification Dfb) with warm, humid summers and cold, snowy winters. Vermont in the west, the Canadian provinces of Quebec in the north, Maine and the Atlantic Ocean in the east, and Massachusetts in the south border the state. The climate varies between hot summers (Köppen Dfa) in the south to cold summers and subarctic winters (Köppen Dfc) in the north - the Atlantic Ocean influences the weather in the southeastern part of New Hampshire, while mountain ranges hold sway in the north.

New Hampshire, the Granite State, is home to the White Mountains range that is part of the Appalachian Trail and spreads in the north to the central portion of the state. Mount Washington, Mount Madison and Mount Adams in the range experience some of the most violent winds in the United States. New Hampshire forests are mostly of the temperate broadleaf and mixed type and consist of conifers and northern hardwoods of the New England - Acadian variety. Mixed oaks and northeastern coastal forests adorn the southeastern part of the state. The North Country, which is the northern one-third part of the state, experiences severe cold and heavy snowfall during the winter and has some of the best places in the country to ski and snowboard.

Summers have average daytime highs in the 70°F (21.1°C) to 85°F (29.4°C) range at the peak of July and are warm and humid. Winters have average lows in the -4°F (-20°C) to 15°F (-9.4°C) range in January and are cold, icy and snowy. The northern wilderness regularly drops below 0°F (-17.8°C) during the winter.
Spring and summers produce moderate rain and are prone to thunderstorms. Hurricanes and tornadoes of variable intensity operate from late spring to fall. Snowstorms are frequent during the winter. Strong arctic winds sweep through the Canadian plains and reach unabated to the northern frontiers of New Hampshire. The northern mountain ranges protect the southern part of the state from the cold fronts, and the Atlantic Ocean regulates temperatures in the southeast.

New Hampshire averages an annual rainfall of 40" (1016mm) with significant variations in the White Mountains range and northern highlands. Rain is evenly distributed throughout the year. Snowfall is heavy during the winter and accumulates 60" (1524mm) to 100" (2540mm) statewide with a higher range in the mountains. Nashua recorded New Hampshire's highest temperature of 106°F (41.1°C) on July 4, 1911, while Mount Washington recorded the lowest temperature of -47°F (-43.9°C) on January 29, 1934.

The best time to visit New Hampshire

The best time to visit New Hampshire is during the summer to early fall - from June to September when the temperatures are between moderately warm in the north to hot in the south.
Spring is rainy, cold, and prone to thunderstorms as well as snowstorms. Autumn gets cold by late October, and the conditions are often windy. Summers tend to be temperate, with temperatures rarely crossing 90°F (32.2°C) in the north.
New Hampshire has the smallest ocean coastline in the United States, and tourists flock to Hampton Beach and the White Mountains during the summer. Early fall is the best time to view the beautiful fall foliage and get a few discounts as the tourist season wanes.

The worst time to visit New Hampshire

The late fall and winter season from November to February is the worst time to visit New Hampshire as the state experience severe cold weather and snowy conditions.
Cold fronts are common as early as October, and the first of the snowstorms usually happen by November. Mountain passes and trails are risky to traverse during the winter as they accumulate vast amounts of snow. Winter days are short, and the weak sunlight is available only for a few hours.
Winter is generally an off-season for the family vacation traveler but provides energetic and adventure sports fanatics with one of the best environments for skiing, snowboarding, and many more activities.

Weather hazards

New Hampshire is prone to wildfires, thunderstorms, hurricanes, and tornadoes in late spring and summer. Cyclones that originate in the Atlantic Ocean affect the state, and at least two tornadoes every year mark their presence in the state.
Snowstorms are frequent during the winter and turn into blizzards that deposit vast amounts of snow that stalls towns and cities for days. Strong winds and bitter winter cold makes the winters dark and dreary as the roads become routinely impassable amid poor visibility, ice, and snow.

Weather in January

January is usually the coldest month of the year in New Hampshire as the temperatures are in a race towards the bottom. The bottom may hit -25°F (-31.7°C) or even lower. The average low temperatures are in the frigid -4°F (-20°C) to 15°F (-9.4°C), while the average high temperatures are in the 14°F (-10°C) to 34°F (1.1°C) zone. Weather in January »

Weather in February

February provides no respite to the cold in New Hampshire as the average temperatures are in the cold -2°F (-18.9°C) to 38°F (3.3°C) zone across the state. Berlin in the north averages between a frigid 7°F (-13.9°C) to 30°F (-1.1°C), while Concord, the state capital, in the south, is between a cold 14°F (-10°C) to 35°F (1.7°C). The sun regularly hides for many days as clouds cover the skies, and the days are short. Weather in February »

Weather in March

March is cold in New Hampshire as early spring thaws the winter ice and snow. Day temperatures are a little warm in the 35°F (1.7°C) to 45°F (7.2°C), while the night temperatures plummet to the 15°F (-9.4°C) to 25°F (-3.9°C) range. March is rainy - the average precipitation in the state is 3" (76mm), while the snowfall easily accumulates to 15" (381mm). Weather in March »

Weather in April

April is a wet month during the spring of New Hampshire with warm days and cold nights. The last snow of the season usually disappears by the end of the month and takes the form of rain that averages 4" (102mm) to 5" (127mm) in the state. Weather in April »

Weather in May

May is a beautiful spring month in New Hampshire with comfortably warm weather conditions. The average high temperatures are in the pleasant 60°F (15.6°C) to 70°F (21.1°C), while the nights are in the average range of 40°F (4.4°C) to 45°F (7.2°C). The chirping of birds, fresh aroma of flowers, freshwater in ponds, lakes, and rivers, and the warmth of the sun creates a brilliant atmosphere full of energy and activity. Weather in May »

Weather in June

June has one of the best weather conditions in New Hampshire with moderate warmth amid long and mostly sunny days. The average high temperatures are in the wonderful 70°F (21.1°C) to 80°F (26.7°C) range, while average low temperatures are comfortable 50°F (10°C) to 55°F (12.8°C). Weather in June »

Weather in July

July is usually the hottest month of the year in New Hampshire with the average high temperatures in the state of 75°F (23.9°C) to 85°F (29.4°C) and the average low temperatures of 55°F (12.8°C) to 65°F (18.3°C). Manchester, the most populated city in New Hampshire, averages 64°F (17.8°C) to 82°F (27.8°C). Rain is frequent and amounts to 5" (127mm) in the state. Weather in July »

Weather in August

August is a hot summer month in New Hampshire with average high temperatures in the 73°F (22.8°C) to 81°F (27.2°C). Nashua in the south averages between 58°F (14.4°C) to 81°F (27.2°C), while Tamworth in the north is between 50°F (10°C) to 78°F (25.6°C). Weather in August »

Weather in September

September transitions to the beautiful autumn season with delectably warm temperatures. The atmosphere is damp, and the sun peeks out of the cloud cover now and then. Sunny days are plenty, and the daylight hours are long. The average high temperatures are in the ideal 65°F (18.3°C) to 75°F (23.9°C) range, while the nights are relatively cooler in the average low-temperature range of 45°F (7.2°C) to 55°F (12.8°C). Summer thunderstorms extend to the early fall season, and there is an outside chance of a hurricane or tornado with its origins in the Atlantic Ocean. Weather in September »

Weather in October

October has warm days and displays peak fall foliage with brilliant shades of red, orange, yellow, magenta, and purple. It is one of the best times to visit New Hampshire to witness the natural beauty of the region with a broad palette of colors amid the backdrop of the panoramic mountains. Average high temperatures are in the range of 55°F (12.8°C) to 65°F (18.3°C), while average low temperatures register 35°F (1.7°C) to 40°F (4.4°C) across the state. Weather in October »

Weather in November

November is the end of the autumn season in New Hampshire and the gateway to the winter with temperatures in the average range of 25°F (-3.9°C) to 50°F (10°C) in the state. Bethlehem in the north averages 24°F (-4.4°C) to 44°F (6.7°C), while Durham in the south is between 31°F (-0.6°C) to 50°F (10°C). Rain accumulates in the 3" (76mm) to 4" (102mm) range in the state as November records the first snow of the season. Weather in November »

Weather in December

December is cold in New Hampshire with gloomy skies, moderate rain, and abundant snow. The average high temperatures are in the 33°F (0.6°C) to 38°F (3.3°C) range in the south and 27°F (-2.8°C) to 34°F (1.1°C) in the north. Weather in December »


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