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December Weather in Salem, United States

Last updated: June 24, 2025

In December, the average temperature in Salem, United States is a chilly -3°C (26°F), with minimums plunging to -20°C (-4°F) and maximums reaching a mild 14°C (58°F). Expect about 49 mm (1.9 in) of precipitation over 10 days, while humidity hovers around a brisk 87%.

December Temperature in Salem

In December in Salem, the average temperature is -3°C (26°F), with maximums reaching 14°C (58°F) and minimums plummeting as low as -20°C (-4°F). Travelers should be prepared for a wide range of temperatures, from chilly days to potentially severe cold nights.

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 -3°C (26°F), with highs reaching up to 14°C (58°F) and lows dropping to around -20°C (-4°F).
JanFebMarAprMayJunJulAugSepOctNovDec242837465771797666483926
Data source: Temperature data for Salem generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Salem

In Salem in December, the total precipitation amount is 49 mm (1.9 in) over the course of 10 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 49 mm (1.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec535560474211101723373249
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Salem

In Salem in December, humidity is 87%. With an average temperature of -3°C (26°F), this humidity feels like walking through a thick fog, making travels uncomfortable and adding a chill that seeps into your bones.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%77%70%54%45%37%34%47%67%82%87%
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 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Salem, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46910111212119753
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.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)53 mm (2.1 inches)87%moderate
February Weather-2°C (29°F)55 mm (2.2 inches)88%high
March Weather3°C (37°F)60 mm (2.4 inches)77%very high
April Weather8°C (46°F)47 mm (1.9 inches)69%very high
May Weather14°C (57°F)41 mm (1.6 inches)54%extreme
June Weather22°C (71°F)11 mm (0.4 inches)45%extreme
July Weather26°C (79°F)10 mm (0.4 inches)37%extreme
August Weather24°C (76°F)17 mm (0.7 inches)34%extreme
September Weather19°C (66°F)23 mm (0.9 inches)47%very high
October Weather9°C (49°F)37 mm (1.5 inches)67%high
November Weather4°C (39°F)32 mm (1.3 inches)82%moderate
December Weather-3°C (26°F)49 mm (1.9 inches)87%moderate

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