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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). Temperatures can range from a chilly -15°C (6°F) to a pleasant 21°C (71°F). Expect about 105 mm (4.1 in) of precipitation over 9 days, along with an average humidity of a high 87%. Prepare for an interesting mix of weather!

December Temperature in Salem

In December in Salem, the average temperature is 4°C (40°F). Maximums can reach 21°C (71°F), while minimums can drop as low as -15°C (6°F). Travelers should be prepared for a wide range of temperatures and ensure they have suitable clothing for both warm and cold conditions.

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 21°C (71°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec343847556774787671604440
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 reaches 105 mm (4.1 in) over the course of 9 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 105 mm (4.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec841191381391381489810310210394105
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 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%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.
JanFebMarAprMayJunJulAugSepOctNovDec35710101110108643
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 (35°F)84 mm (3.3 inches)87%moderate
February Weather3°C (38°F)119 mm (4.7 inches)85%moderate
March Weather8°C (47°F)138 mm (5.4 inches)86%high
April Weather13°C (55°F)139 mm (5.5 inches)84%very high
May Weather19°C (67°F)138 mm (5.4 inches)79%very high
June Weather24°C (75°F)148 mm (5.8 inches)82%extreme
July Weather26°C (78°F)98 mm (3.9 inches)79%very high
August Weather24°C (76°F)103 mm (4.1 inches)70%very high
September Weather22°C (71°F)102 mm (4.0 inches)69%very high
October Weather15°C (60°F)103 mm (4.0 inches)76%high
November Weather7°C (45°F)93 mm (3.7 inches)88%moderate
December Weather4°C (40°F)105 mm (4.1 inches)87%moderate

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