December weather forecast
Brookline, MA

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, the first month of the winter in Brookline, is still a cold month, with an average temperature ranging between max 39.6°F (4.2°C) and min 29.3°F (-1.5°C).

Temperature

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

Humidity

In December, the average relative humidity is 76%.

Rainfall

In December, the rain falls for 5.6 days. Throughout December, 0.55" (14mm) of precipitation is accumulated. Throughout the year, in Brookline, 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. 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

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

Sunshine

The average sunshine in December in Brookline 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 in Brookline. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary 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 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Brookline?

In December, in Brookline, the average high-temperature is 39.6°F (4.2°C), and the average low-temperature is 29.3°F (-1.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), 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 many days does it rain in December in Brookline?

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. Snow falls for 2.7 days and accumulates 0.71" (18mm) of snow.

How much does it snow in Brookline in December?

In Brookline, 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 Brookline?

The month with the shortest days in Brookline is December, with an average of 9h and 8min of daylight.

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

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

What time are sunrise and sunset in December in Brookline?

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

How long on average sun shines in December in Brookline?

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

When is the lowest UV index in Brookline?

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

What is the UV index intensity in December in Brookline?

In December, the average daily maximum UV index in Brookline is 2. A UV Index reading of 2, and below, represents a low health threat 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 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: 4h and 54min

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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