December Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the average temperature in December hovers around -4°C (26°F), with extremes ranging from a chilling -29°C (-20°F) to a mild 16°C (61°F). During this month, expect about 35 mm (1.4 in) of precipitation over 4 days, while the average humidity remains at a comfortable 79%.

December Temperature in Salem

In December in Salem, the average temperature is -4°C (26°F), with maximums reaching 16°C (61°F) and minimums dropping as low as -29°C (-20°F). Travelers should be prepared for a wide range of weather conditions during this time.

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

The chart illustrates December temperature patterns in Salem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Salem, December typically has an average temperature of -4°C (26°F), with highs reaching up to 16°C (61°F) and lows dropping to around -29°C (-20°F).

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

December Precipitation in Salem

In Salem in December, the precipitation amount is 35 mm (1.4 in) over a span of 4 days.

December Precipitation Trends in Salem

The chart displays monthly precipitation patterns in Salem, 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 Salem, December typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 4 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 Salem

In Salem in December, humidity is 79%. With an average temperature of -4°C (26°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities more strenuous and uncomfortable for travelers unprepared for the cold's damp embrace.

December Average Humidity in Salem

This chart illustrates the average monthly humidity levels in Salem, 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 Salem is approximately 79%, 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 Salem

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

Maximum UV Index Levels in Salem for December

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

Data source: Salem 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 Salem Compares to Other Months

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

This table compares monthly weather conditions in Salem, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	18 mm (0.7 inches)	77%	low
February Weather	-7°C (19°F)	20 mm (0.8 inches)	81%	moderate
March Weather	1°C (35°F)	60 mm (2.4 inches)	71%	moderate
April Weather	7°C (44°F)	76 mm (3.0 inches)	75%	very high
May Weather	15°C (59°F)	104 mm (4.1 inches)	74%	very high
June Weather	23°C (73°F)	75 mm (2.9 inches)	82%	extreme
July Weather	24°C (76°F)	85 mm (3.4 inches)	84%	very high
August Weather	22°C (72°F)	90 mm (3.6 inches)	82%	very high
September Weather	18°C (65°F)	86 mm (3.4 inches)	75%	very high
October Weather	9°C (48°F)	77 mm (3.0 inches)	72%	moderate
November Weather	1°C (35°F)	23 mm (0.9 inches)	81%	moderate
December Weather	-4°C (26°F)	35 mm (1.4 inches)	79%	low