Sullivan
New Hampshire, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Sullivan, NH

January, like December, is a freezing cold winter month in Sullivan, New Hampshire, with temperature in the range of an average high of 27.9°F (-2.3°C) and an average low of 15.1°F (-9.4°C). The coldest month is January, with an average high-temperature of 27.9°F (-2.3°C) and an average low-temperature of 15.1°F (-9.4°C). Weather in January »

February, the last month of the winter, in Sullivan, is also a subzero cold month, with temperature in the range of an average high of 31.1°F (-0.5°C) and an average low of 16.5°F (-8.6°C). In February, the average high-temperature is essentially the same as in January - a still freezing cold 31.1°F (-0.5°C). Weather in February »

March, the first month of the spring, in Sullivan, is a cold month, with average temperature fluctuating between 24.3°F (-4.3°C) and 39.4°F (4.1°C). In March, the average high-temperature slightly increases, from a freezing cold 31.1°F (-0.5°C) in February, to a wintry 39.4°F (4.1°C). Weather in March »

April in Sullivan, New Hampshire, is a fresh spring month, with average temperature varying between 35.1°F (1.7°C) and 52.9°F (11.6°C). In April, the average high-temperature rises, from a wintry 39.4°F (4.1°C) in March, to a fresh 52.9°F (11.6°C). Weather in April »

The last month of the spring, May, is a comfortable month in Sullivan, New Hampshire, with temperature in the range of an average low of 45.3°F (7.4°C) and an average high of 66°F (18.9°C). In Sullivan, the average high-temperature in May increases, from a cool 52.9°F (11.6°C) in April, to a comfortable 66°F (18.9°C). Weather in May »

June, the first month of the summer, in Sullivan, is a pleasant month, with average temperature varying between 73.2°F (22.9°C) and 52.5°F (11.4°C). In Sullivan, the average high-temperature in June marginally rises, from a comfortable 66°F (18.9°C) in May, to an agreeable 73.2°F (22.9°C). Weather in June »

July in Sullivan, New Hampshire, is a warm summer month, with average temperature ranging between max 79.9°F (26.6°C) and min 58.6°F (14.8°C). July is the warmest month, with an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 58.6°F (14.8°C). Weather in July »

August, the last month of the summer, in Sullivan, is also a moderately hot month, with average temperature fluctuating between 78.1°F (25.6°C) and 56.8°F (13.8°C). In August, the average high-temperature is relatively the same as in July - a still warm 78.1°F (25.6°C). Weather in August »

The first month of the autumn, September, is also an agreeable month in Sullivan, New Hampshire, with average temperature ranging between max 70°F (21.1°C) and min 50.9°F (10.5°C). In Sullivan, New Hampshire, the average high-temperature marginally drops, from a moderately hot 78.1°F (25.6°C) in August, to an agreeable 70°F (21.1°C). Weather in September »

October, the same as September, in Sullivan, New Hampshire, is a moderate autumn month, with average temperature ranging between min 42.1°F (5.6°C) and max 56.8°F (13.8°C). In Sullivan, the average high-temperature decreases, from a pleasant 70°F (21.1°C) in September, to a moderate 56.8°F (13.8°C). Weather in October »

The last month of the autumn, November, is also a frosty month in Sullivan, New Hampshire, with average temperature fluctuating between 44.4°F (6.9°C) and 31.3°F (-0.4°C). In Sullivan, the average high-temperature in November decreases, from a mild 56.8°F (13.8°C) in October, to a chilly 44.4°F (6.9°C). Weather in November »

The first month of the winter, December, is also a wintry month in Sullivan, New Hampshire, with average temperature ranging between min 22.8°F (-5.1°C) and max 33.4°F (0.8°C). In December, the average high-temperature drops, from a chilly 44.4°F (6.9°C) in November, to a cold 33.4°F (0.8°C). Weather in December »

What is the coldest month in Sullivan?

With an average high-temperature of 27.9°F (-2.3°C) and an average low-temperature of 15.1°F (-9.4°C), January is the coldest month in Sullivan, New Hampshire.

How much does it rain in Sullivan?

In Sullivan, during the entire year, the rain falls for 125.1 days and collects up to 11.69" (297mm) of precipitation.

When does it snow in Sullivan?

Months with snowfall in Sullivan are January through May, October through December.

How much does it snow in Sullivan?

Throughout the year, in Sullivan, there are 39.8 snowfall days, and 10.2" (259mm) of snow is accumulated.

When does it snow the most in Sullivan?

The month with the most snowfall in Sullivan, New Hampshire, is January when snow falls for 9.2 days and typically aggregates up to 2.64" (67mm) of snow.

When is the lowest UV index in Sullivan?

Months with the lowest UV index in Sullivan are January through March, October through December, with an average maximum UV index of 2.

What is the most humid month in Sullivan?

February is the most humid month in Sullivan, New Hampshire, with an average relative humidity of 85%.

What is the month with the least sunshine in Sullivan?

With an average of 4.4h of sunshine, February has the least sunshine of the year.

What is the driest month in Sullivan?

March is the month with the least rainfall in Sullivan. Rain falls for 10 days and accumulates 0.75" (19mm) of precipitation.

What is the least humid month in Sullivan?

With an average relative humidity of 74%, April is the least humid month in Sullivan, New Hampshire.

When it does not snow in Sullivan?

In Sullivan snow does not fall in June through September.

When are the longest days in Sullivan?

The month with the longest days in Sullivan, New Hampshire, is June, with an average of 15.3h of daylight.

What is the warmest month in Sullivan?

With an average high-temperature of 79.9°F (26.6°C) and an average low-temperature of 58.6°F (14.8°C), July is the warmest month.

What is the wettest month in Sullivan?

July is the month with the most rainfall in Sullivan. Rain falls for 13.3 days and accumulates 1.3" (33mm) of precipitation.

When is the highest UV index in Sullivan?

With an average maximum UV index of 6, July is the month with the highest UV index in Sullivan.

What month has the most sunshine in Sullivan?

The month with the most sunshine is August, with an average of 10.3h of sunshine.

What is the month with the shortest days in Sullivan?

With an average of 9.1h of daylight, December has the shortest days of the year.
Average temperature - Sullivan, NH
Average rainfall - Sullivan, NH
Average rainfall days - Sullivan, NH

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (6.3 days).

Average snowfall - Sullivan, NH
Average snowfall days - Sullivan, NH

The month with the highest number of snowfall days is February (9.4 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine - Sullivan, NH

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

The month with the most sunshine is August (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.4h).

Average UV index - Sullivan, NH