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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 8°C (46°F). Expect a chilly minimum of -7°C (20°F) and a pleasant maximum of 22°C (73°F). Be prepared for some light rain, with 11 mm (0.4 in) of precipitation spread over 2 days. The air will feel quite humid, with an average humidity level of 82%.

December Temperature in Salem

In December in Salem, the average temperature is 8°C (46°F). Maximum temperatures can reach 22°C (73°F), while the minimum can dip as low as -7°C (20°F). This diverse temperature range makes it essential for travelers to pack layers to stay comfortable throughout the day.

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 8°C (46°F), with highs reaching up to 22°C (73°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec454957667482838276655446
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 11 mm (0.4 in) over the course of 2 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 11 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec1418144422302728322111
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 82%. With an average temperature of 8°C (46°F), this humidity feels like a thick, damp blanket wrapping around you, making travel uncomfortable and creating a sense of heaviness in the air that can sap your energy quickly.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%79%65%55%54%53%55%58%70%75%83%82%
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 reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the 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 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710121213121211865
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 Weather7°C (45°F)14 mm (0.6 inches)79%moderate
February Weather9°C (49°F)18 mm (0.7 inches)79%high
March Weather14°C (57°F)14 mm (0.6 inches)65%very high
April Weather19°C (66°F)4 mm (0.1 inches)55%extreme
May Weather23°C (74°F)4 mm (0.2 inches)54%extreme
June Weather28°C (83°F)22 mm (0.9 inches)53%extreme
July Weather28°C (83°F)30 mm (1.2 inches)55%extreme
August Weather28°C (82°F)27 mm (1.1 inches)57%extreme
September Weather25°C (77°F)28 mm (1.1 inches)70%extreme
October Weather18°C (65°F)32 mm (1.3 inches)75%very high
November Weather12°C (55°F)21 mm (0.8 inches)83%high
December Weather8°C (46°F)11 mm (0.4 inches)82%moderate

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