December weather forecast
Cambridge, MA

The John Weeks Memorial Footbridge in Cambridge, Massachusetts, over the Charles River calm waters, and a distant view of the Havard University student residence unit
The John Weeks Memorial Footbridge in Cambridge, Massachusetts, over the Charles River calm waters, and a distant view of the Havard University student residence unit

Weather in December

The first month of the winter, December, is still a cold month in Cambridge, Massachusetts, with temperature in the range of an average low of 29.3°F (-1.5°C) and an average high of 39.6°F (4.2°C).

Temperature

In December, the average high-temperature decreases from a frosty 49.5°F (9.7°C) in November to a wintry 39.6°F (4.2°C). In December, the average low-temperature is 29.3°F (-1.5°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, in Cambridge, the rain falls for 5.6 days. Throughout December, 0.55" (14mm) of precipitation is accumulated. Throughout the year, there are 81.8 rainfall days, and 5.51" (140mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Cambridge are January through May, November and December. The month with the most snowfall in Cambridge is December, when snow falls for 2.7 days and typically aggregates up to 0.71" (18mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 8min of daylight.
On the first day of December in Cambridge, sunrise is at 6:54 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:21 pm EST.

Sunshine

In December, the average sunshine is 4.9h.

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 of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Cambridge?

In Cambridge, Massachusetts, the average relative humidity in December is 76%.

How many days does it rain in December in Cambridge?

In Cambridge, Massachusetts, during December, the rain falls for 5.6 days and regularly aggregates up to 0.55" (14mm) of precipitation.

When does it snow the most in Cambridge?

The month with the most snowfall is December, when snow falls for 2.7 days and typically aggregates up to 0.71" (18mm) of snow.

How many days does it snow in December in Cambridge?

In Cambridge, Massachusetts, in December, snow falls for 2.7 days, with typically accumulated 0.71" (18mm) of snow.

What is the month with the shortest days in Cambridge?

December has the shortest days of the year in Cambridge, with an average of 9h and 8min of daylight.

How many hours of daylight does Cambridge have in December?

The average day length in December in Cambridge, Massachusetts, is 9h and 8min.

When are sunrise and sunset in December in Cambridge?

In December, on the first day of the month, sunrise is at 6:54 am and sunset at 4:12 pm. On the last day of the month, in Cambridge, sunrise is at 7:13 am and sunset at 4:21 pm EST.

How many hours of sunshine does Cambridge have in December?

In December, the average sunshine duration in Cambridge is 4.9h.

When is the lowest UV index in Cambridge?

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

What is the UV index reading in December in Cambridge?

In December, the average daily maximum UV index in Cambridge is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.

Average temperature in December
Cambridge, MA

Average temperature in December - Cambridge, MA
  • Average high temperature in December: 39.6°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 29.3°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in December
Cambridge, MA

Average pressure in December - Cambridge, MA
  • Average pressure in December: 30.03"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in December
Cambridge, MA

Average wind speed in December - Cambridge, MA
  • Average wind speed in December: 9mph

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in December
Cambridge, MA

Average humidity in December - Cambridge, MA
  • Average humidity in December: 76%

The months with the highest relative humidity are January and February (77%).
The month with the lowest relative humidity is April (69%).

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Average rainfall in December
Cambridge, MA

Average rainfall in December - Cambridge, MA
  • Average rainfall in December: 0.55"

The wettest month (with the highest rainfall) is November (0.63").
The driest month (with the least rainfall) is September (0.2").

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Average rainfall days in December
Cambridge, MA

Average rainfall days in December - Cambridge, MA
  • Average rainfall days in December: 5.6 days

The month with the highest number of rainy days is July (9.6 days).
The month with the least rainy days is January (4.3 days).

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Average snowfall in December
Cambridge, MA

Average snowfall in December - Cambridge, MA
  • Average snowfall in December: 0.71"

The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Cambridge, MA

Average snowfall days in December - Cambridge, MA
  • Average snowfall days in December: 2.7 days

The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Cambridge, MA

Average daylight in December / Average sunshine in December - Cambridge, MA
  • Average daylight in December: 9h and 8min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in December: 4.9h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in December
Cambridge, MA

Average sunshine days in December - Cambridge, MA
  • Average sunshine days in December: 23 days

The month with the most sunshine days is January (23.5 days).
The month with the least sunshine days is June (17.4 days).

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Average UV index in December
Cambridge, MA

Average UV index in December - Cambridge, MA
  • 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
Cambridge, MA

Average cloud cover in December - Cambridge, MA
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in December
Cambridge, MA

Average visibility in December - Cambridge, MA
  • Average visibility in December: 6mi

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

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