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December Weather in Salem, United States

Last updated: June 24, 2025

In December, the average temperature in Salem, United States hovers around 4°C (40°F), providing a crisp ambiance. While you might experience lows of -15°C (6°F), the weather can also surprise you with highs reaching 25°C (78°F). Expect 60 mm (2.4 in) of precipitation over about 7 days, with an average humidity level of 86% to keep the air refreshingly moist.

December Temperature in Salem

In December in Salem, the average temperature is 4°C (40°F). Maximums can reach 25°C (78°F) and minimums can be as low as -15°C (6°F). It's essential to pack accordingly for a wide range of temperatures while enjoying your travels.

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 (40°F), with highs reaching up to 25°C (78°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748546574787571584540
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 precipitation amount is 60 mm (2.4 in) over the course of 7 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 60 mm (2.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec75961361531788484101591126961
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 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%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.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather1°C (34°F)75 mm (3.0 inches)83%moderate
February Weather3°C (37°F)96 mm (3.8 inches)81%high
March Weather9°C (48°F)136 mm (5.3 inches)80%high
April Weather12°C (55°F)152 mm (6.0 inches)80%very high
May Weather18°C (66°F)178 mm (7.0 inches)83%very high
June Weather24°C (75°F)84 mm (3.3 inches)83%extreme
July Weather26°C (79°F)84 mm (3.3 inches)76%extreme
August Weather24°C (76°F)101 mm (4.0 inches)69%very high
September Weather22°C (72°F)59 mm (2.3 inches)68%very high
October Weather15°C (58°F)112 mm (4.4 inches)72%high
November Weather7°C (45°F)69 mm (2.7 inches)83%moderate
December Weather4°C (40°F)60 mm (2.4 inches)86%moderate

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