December weather forecast
Brookline, MA

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A small league field in Brookline, Massachusetts, overlooking bright yellow trees in the fall, behind the cityscape of Boston
A small league field in Brookline, Massachusetts, overlooking bright yellow trees in the fall, behind the cityscape of Boston

Weather in December

December heralds the arrival of winter in Brookline with temperatures often plunging to an average low of 29.3°F (-1.5°C). A significant shift from the 37.4°F (3°C) in November, December is undoubtedly the coldest month. The scant daylight hours and consistent snowfall paint a tranquil winter picture. Despite the chill, Brookline basks in the festive holiday spirit, with lights and decorations brightening the short days. The sharp winds and the snowy landscapes, characteristic of Brookline in December, make for a classic New England winter end to the year.

Temperature

In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 49.5°F (9.7°C) in November to an icy 39.6°F (4.2°C). Brookline's average low-temperature for the month of December records at a freezing cold 29.3°F (-1.5°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In Brookline, during December, the rain falls for 5.6 days and regularly aggregates up to 0.55" (14mm) of precipitation. In Brookline, Massachusetts, during the entire year, the rain falls for 81.8 days and collects up to 5.51" (140mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Brookline. The month with the most snowfall in Brookline, Massachusetts, 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 in Brookline, with an average of 9h and 6min of daylight.
On the first day of December, 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 4:22 pm EST.

Sunshine

The average sunshine in December in Brookline is 4.9h.

UV index

The months with the lowest UV index in Brookline 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 vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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Frequently asked questions

How cold does it get in Brookline in December?

In Brookline, 39.6°F (4.2°C) is the average high-temperature and 29.3°F (-1.5°C) is the average low-temperature during December. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in July is calculated to be 86°F (30°C).

What is the average humidity in December in Brookline?

The average relative humidity in December is 76%.

How much does it rain in Brookline in December?

In Brookline, 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 Brookline?

December is the month with the most snowfall in Brookline, Massachusetts. Snow falls for 2.7 days and accumulates 0.71" (18mm) of snow.

How much does it snow in Brookline in December?

In Brookline, during December, snow falls for 2.7 days and regularly aggregates up to 0.71" (18mm) of snow.

What is the month with the shortest days in Brookline?

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

How many hours of daylight does Brookline have in December?

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

When are sunrise and sunset in December in Brookline?

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 Brookline, Massachusetts, sunrise is at 7:13 am and sunset at 4:22 pm EST.

How long on average sun shines in December in Brookline?

The average sunshine duration in December in Brookline is 4.9h.

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

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

What is the UV index reading in December in Brookline?

In Brookline, Massachusetts, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to UV radiation.
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
Brookline, MA

Average temperature in December - Brookline, 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
Brookline, MA

Average pressure in December - Brookline, 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
Brookline, MA

Average wind speed in December - Brookline, 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
Brookline, MA

Average humidity in December - Brookline, 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
Brookline, MA

Average rainfall in December - Brookline, 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
Brookline, MA

Average rainfall days in December - Brookline, 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
Brookline, MA

Average snowfall in December - Brookline, 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
Brookline, MA

Average snowfall days in December - Brookline, 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
Brookline, MA

Average daylight in December / Average sunshine in December - Brookline, MA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Brookline, MA

Average sunshine days in December - Brookline, 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
Brookline, MA

Average UV index in December - Brookline, 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
Brookline, MA

Average cloud cover in December - Brookline, 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
Brookline, MA

Average visibility in December - Brookline, 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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Brookline, Massachusetts, USA

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