December weather forecast
Manchester, NH

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The colorful buildings in the city of Manchester, New Hampshire, right next to scenic trees on the seashore, a beautiful glass image in the river below
The colorful buildings in the city of Manchester, New Hampshire, right next to scenic trees on the seashore, a beautiful glass image in the river below

Weather in December

December marks the beginning of winter in Manchester, with the city's weather taking a decisively cold turn. The most noticeable change is in the form of snowfall, which increases to 2.99" (76mm) compared to November. Light and joy define the festive month with holiday decorations lighting up the shorter, darker days. Despite the chill, the bustling holiday season keeps the city warm and vibrant.

Temperature

The beginning of December marks a decrease in the average high-temperature, transitioning from a chilly 46.6°F (8.1°C) in November to an icy 36.3°F (2.4°C). An average low-temperature of 25.3°F (-3.7°C) is common during the nights of December.

Humidity

The average relative humidity in December is 79%.

Rainfall

In Manchester, during December, the rain falls for 6.3 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, there are 104.4 rainfall days, and 12.95" (329mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Manchester. The month with the most snowfall is December, when snow falls for 4 days and typically aggregates up to 2.99" (76mm) of snow.

Daylight

December has the shortest days of the year in Manchester, New Hampshire, with an average of 9h and 6min of daylight.
On the first day of December in Manchester, New Hampshire, sunrise is at 6:57 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:21 pm EST.

Sunshine

The average sunshine in December in Manchester is 4.8h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The daily high UV index of 2 during December translates into the following recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is it in Manchester in December?

In December, the average high-temperature and low-temperature are 36.3°F (2.4°C) and 25.3°F (-3.7°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in July is computed to be 86°F (30°C).

What is the average humidity in December in Manchester?

In December, the average relative humidity is 79%.

How much does it rain in Manchester in December?

In December, the rain falls for 6.3 days. Throughout December, 1.1" (28mm) of precipitation is accumulated.

When does it snow the most in Manchester?

The month with the most snowfall is December, when snow falls for 4 days and typically aggregates up to 2.99" (76mm) of snow.

How many days does it snow in December in Manchester?

In Manchester, New Hampshire, during December, snow falls for 4 days and regularly aggregates up to 2.99" (76mm) of snow.

What is the month with the shortest days in Manchester?

With an average of 9h and 6min of daylight, December has the shortest days of the year in Manchester.

What is the average length of the day in December in Manchester?

The average day length in December is 9h and 4min.

When are sunrise and sunset in December in Manchester?

On the first day of December in Manchester, New Hampshire, sunrise is at 6:57 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:21 pm EST.

How many hours of sunshine does Manchester have in December?

The average sunshine duration in December in Manchester is 4.8h.

What is the month with the lowest UV index in Manchester?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Manchester, New Hampshire.

What is the UV index intensity in December in Manchester?

In December, the average daily maximum UV index in Manchester, New Hampshire, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Manchester, NH

Average temperature in December - Manchester, NH
  • Average high temperature in December: 36.3°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 25.3°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (18°F).

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Average pressure in December
Manchester, NH

Average pressure in December - Manchester, NH
  • Average pressure in December: 30.03"Hg

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Manchester, NH

Average wind speed in December - Manchester, NH
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is January (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in December
Manchester, NH

Average humidity in December - Manchester, NH
  • Average humidity in December: 79%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Manchester, NH

Average rainfall in December - Manchester, NH
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is October (1.38").
The driest month (with the least rainfall) is January (0.75").

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Average rainfall days in December
Manchester, NH

Average rainfall days in December - Manchester, NH
  • Average rainfall days in December: 6.3 days

The month with the highest number of rainy days is June (12.1 days).
The month with the least rainy days is January (4.1 days).

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Average snowfall in December
Manchester, NH

Average snowfall in December - Manchester, NH
  • Average snowfall in December: 2.99"

The month with the highest snowfall is December (2.99").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Manchester, NH

Average snowfall days in December - Manchester, NH
  • Average snowfall days in December: 4 days

The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Manchester, NH

Average daylight in December / Average sunshine in December - Manchester, NH
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Manchester, NH

Average sunshine days in December - Manchester, NH
  • Average sunshine days in December: 21.3 days

The months with the most sunshine days are January and December (21.3 days).
The month with the least sunshine days is June (16.7 days).

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Average UV index in December
Manchester, NH

Average UV index in December - Manchester, NH
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Manchester, NH

Average cloud cover in December - Manchester, NH
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in December
Manchester, NH

Average visibility in December - Manchester, NH
  • Average visibility in December: 6mi

The months with the highest visibility are January, April, November and December (6mi).
The months with the lowest visibility are February, March, May, June, July, August, September and October (5mi).

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Manchester, New Hampshire, USA

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