December weather forecast and climate
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
December, the first month of the winter, in Cambridge, is also a wintry month, with temperature in the range of an average high of 39.6°F (4.2°C) and an average low of 29.3°F (-1.5°C).

Temperature

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

Humidity

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

Rainfall

In Cambridge, it is raining for 5.6 days, with typically 0.55" (14mm) of accumulated precipitation. Throughout the year, there are 81.8 rainfall days, and 5.51" (140mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. December is the month with the most snowfall. Snow falls for 2.7 days and accumulates 0.71" (18mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9.1h of daylight.

Sunshine

The average sunshine in December is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Cambridge?

In Cambridge, in December, the average high-temperature is 39.6°F (4.2°C), and the average low-temperature is 29.3°F (-1.5°C).

What is the average humidity in December in Cambridge?

The average relative humidity in December in Cambridge is 76%.

How much does it rain in Cambridge in December?

In Cambridge, Massachusetts, in December, it is raining for 5.6 days, with typically 0.55" (14mm) of accumulated precipitation.

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 snowiest month in Cambridge?

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

What is the month with the shortest days in Cambridge?

With an average of 9.1h of daylight, December has the shortest days of the year in Cambridge.

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

In Cambridge, Massachusetts, the average length of the day in December is 9.1h.

How long on average sun shines in December in Cambridge?

In December, the average sunshine is 4.9h.

What are the months with the lowest UV index in Cambridge?

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

How high is the UV index in December in Cambridge?

In December, the average daily maximum UV index in Cambridge, Massachusetts, is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.
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).

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

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

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).

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

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

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").

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).

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

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

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).
Months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December / Average sunshine in December - Cambridge, MA
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

  • 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).

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).

Average UV index in December - Cambridge, MA
  • Average UV index in December: 2

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

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).

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

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