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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 6°C (42°F). You can expect a chilly minimum of -6°C (21°F) and a mild maximum of 17°C (62°F). This month also brings significant precipitation, totaling 173 mm (6.8 in) over approximately 18 days, contributing to an average humidity of 87%. Stay prepared for a damp and cool atmosphere!

December Temperature in Salem

In December in Salem, the average temperature is 6°C (42°F). The maximum can reach 17°C (62°F), and the minimum can be as low as -6°C (21°F). Be prepared for a range of temperatures, making it essential to pack layers for 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 6°C (42°F), with highs reaching up to 17°C (62°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec434247525865717165544742
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 173 mm (6.8 in) over the course of 18 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 173 mm (6.8 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec1411601161014734345382124173
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 6°C (42°F), this humidity feels like a persistent chill that seeps into your bones, making it uncomfortable for traveling and leaving you longing for warmth at every turn.

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.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%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 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.
JanFebMarAprMayJunJulAugSepOctNovDec23579101097532
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 Weather6°C (43°F)141 mm (5.5 inches)85%low
February Weather6°C (43°F)159 mm (6.3 inches)84%moderate
March Weather8°C (47°F)116 mm (4.6 inches)85%moderate
April Weather11°C (52°F)101 mm (4.0 inches)83%high
May Weather15°C (59°F)47 mm (1.9 inches)83%very high
June Weather18°C (65°F)33 mm (1.3 inches)83%very high
July Weather22°C (71°F)3 mm (0.1 inches)82%very high
August Weather22°C (72°F)4 mm (0.2 inches)74%very high
September Weather18°C (65°F)53 mm (2.1 inches)71%high
October Weather12°C (54°F)82 mm (3.2 inches)81%moderate
November Weather9°C (48°F)124 mm (4.9 inches)87%moderate
December Weather6°C (42°F)173 mm (6.8 inches)87%low

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