December Weather in Brookline, United States

Last updated: June 24, 2025

In December, the average temperature in Brookline, United States is a brisk -1°C (31°F), with a range that can dip to a chilling -21°C (-5°F) at its lowest and reach a comfortable high of 16°C (62°F). Expect around 124 mm (4.9 in) of precipitation spread over 10 days, contributing to an average humidity of 81%.

December Temperature in Brookline

In December in Brookline, the average temperature is -1°C (31°F). The maximum can reach 16°C (62°F), while the minimum can drop as low as -21°C (-5°F). Visitors should be prepared for a wide range of temperatures during this month.

December Weather in Brookline: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Brookline, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brookline, December typically has an average temperature of -1°C (31°F), with highs reaching up to 16°C (62°F) and lows dropping to around -21°C (-5°F).

Data source: Temperature data for Brookline generated using information from the Copernicus Climate Change Service.

December Precipitation in Brookline

In Brookline in December, the precipitation amount is 124 mm (4.9 in) spread over a duration of 10 days.

December Precipitation Trends in Brookline

The chart displays monthly precipitation patterns in Brookline, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Brookline, December typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Brookline

In Brookline in December humidity is 81%. With an average temperature of -1°C (31°F), this humidity feels like a heavy, cold mist that clings to your skin, making outdoor adventures damp and challenging.

December Average Humidity in Brookline

This chart illustrates the average monthly humidity levels in Brookline, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Brookline is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Brookline

In Brookline in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Brookline, you can visit Hourly UV Index in Brookline.

Maximum UV Index Levels in Brookline for December

The chart shows the monthly maximum UV Index (UVI) for Brookline in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Brookline typically reaches 2, which falls under the low exposure category.

Data source: Brookline December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Brookline Compares to Other Months

Weather in Brookline varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Brookline, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Brookline, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	75 mm (2.9 inches)	86%	moderate
February Weather	-1°C (30°F)	88 mm (3.5 inches)	84%	moderate
March Weather	2°C (35°F)	83 mm (3.3 inches)	82%	moderate
April Weather	8°C (47°F)	132 mm (5.2 inches)	80%	very high
May Weather	14°C (58°F)	86 mm (3.4 inches)	72%	very high
June Weather	20°C (68°F)	89 mm (3.5 inches)	72%	very high
July Weather	23°C (73°F)	150 mm (5.9 inches)	67%	very high
August Weather	22°C (72°F)	97 mm (3.8 inches)	66%	very high
September Weather	18°C (65°F)	85 mm (3.3 inches)	71%	high
October Weather	12°C (54°F)	134 mm (5.3 inches)	78%	high
November Weather	4°C (40°F)	103 mm (4.0 inches)	84%	moderate
December Weather	-1°C (31°F)	124 mm (4.9 inches)	81%	low