December weather forecast
Brookline, MA

Share
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 the transition to December, Brookline observes a drop in the average high-temperature, moving from a chilly 49.5°F (9.7°C) in November to a cold 39.6°F (4.2°C). Nighttime temperatures hover around an average low of 29.3°F (-1.5°C) in December.

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Brookline, in December, during 5.6 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Brookline, during the entire year, the rain falls for 81.8 days and collects up to 5.51" (140mm) of precipitation.

Snowfall

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

Daylight

December has the shortest days of the year, 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 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 estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index of 2 during December leads to these instructions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.

Frequently asked questions

How cold is it in December?

Brookline in December has an average high-temperature of 39.6°F (4.2°C) and an average low-temperature of 29.3°F (-1.5°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in July is computed to be 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How many days does it rain in December?

In Brookline, in December, during 5.6 rainfall days, 0.55" (14mm) of precipitation is typically accumulated.

When does it snow the most in Brookline?

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

How much does it snow in December?

In December, in Brookline, it is snowing for 2.7 days. Throughout December, 0.71" (18mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

How many hours of daylight does Brookline have in December?

In Brookline, the average day length in December is 9h and 8min.

When is the sunrise / sunset in December?

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, 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 is 4.9h.

When is the lowest UV index?

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 intensity in December?

In Brookline, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's 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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

Brookline, Massachusetts, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location