December Weather in Maine, United States

Last updated: June 24, 2025

In Maine, United States, the average temperature in December hovers around -5°C (23°F), with fluctuations that can see minimums plummeting to -30°C (-22°F) and highs reaching up to 15°C (59°F). During this month, expect about 52 mm (2.1 in) of precipitation spread over 8 days, and a notable average humidity of 87%. Brace yourself for a chilly yet dynamic winter experience!

December Temperature in Maine

In December in Maine, the average temperature is -5°C (23°F). Maximums can reach 15°C (59°F), and minimums can drop as low as -30°C (-22°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates December temperature patterns in Maine, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Maine, December typically has an average temperature of -5°C (23°F), with highs reaching up to 15°C (59°F) and lows dropping to around -30°C (-22°F).

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

December Precipitation in Maine

In Maine in December, the total precipitation amount is 52 mm (2.1 in) over the course of 8 days.

December Precipitation Trends in Maine

The chart displays monthly precipitation patterns in Maine, 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 Maine, December typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 8 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 Maine

In Maine in December humidity is 87%. With an average temperature of -5°C (23°F), this humidity feels like a heavy, damp blanket enveloping you, making even the cold air seem more biting and clammy, which can be quite uncomfortable for traveling.

December Average Humidity in Maine

This chart illustrates the average monthly humidity levels in Maine, 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 Maine is approximately 87%, 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 Maine

In Maine 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 Maine, you can visit Hourly UV Index in Maine.

Maximum UV Index Levels in Maine for December

The chart shows the monthly maximum UV Index (UVI) for Maine 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 Maine typically reaches 2, which falls under the low exposure category.

Data source: Maine 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 Maine Compares to Other Months

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

This table compares monthly weather conditions in Maine, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-9°C (17°F)	34 mm (1.3 inches)	89%	low
February Weather	-8°C (17°F)	50 mm (2.0 inches)	90%	moderate
March Weather	-1°C (31°F)	53 mm (2.1 inches)	87%	moderate
April Weather	5°C (42°F)	98 mm (3.9 inches)	84%	high
May Weather	13°C (56°F)	103 mm (4.1 inches)	77%	very high
June Weather	19°C (67°F)	102 mm (4.0 inches)	75%	very high
July Weather	22°C (71°F)	117 mm (4.6 inches)	74%	very high
August Weather	19°C (67°F)	121 mm (4.8 inches)	73%	very high
September Weather	16°C (61°F)	83 mm (3.3 inches)	78%	high
October Weather	8°C (47°F)	109 mm (4.3 inches)	84%	moderate
November Weather	0°C (32°F)	50 mm (2.0 inches)	89%	moderate
December Weather	-5°C (23°F)	52 mm (2.1 inches)	87%	low