nomadseason

December Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the average temperature in December hovers around 5°C (41°F), with lows dipping to a brisk -12°C (10°F) and highs reaching a mild 21°C (70°F). Expect 95 mm (3.7 in) of precipitation spread over 8 days, and prepare for a notably high average humidity of 86%.

December Temperature in Salem

In December in Salem, the average temperature is 5°C (41°F). Maximum can reach 21°C (70°F) and minimum can be as low as -12°C (10°F). Travelers should be prepared for a wide range of temperatures, from chilly days to surprisingly warm afternoons.

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 5°C (41°F), with highs reaching up to 21°C (70°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec374247566572777569604541
Data source: Temperature data for Salem generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 95 mm (3.7 in) spread over 8 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 95 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec6910574119144114601001121107495
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Salem

In Salem in December humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec36810101110109753
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 Weather3°C (37°F)69 mm (2.7 inches)87%moderate
February Weather6°C (42°F)105 mm (4.1 inches)87%high
March Weather8°C (47°F)74 mm (2.9 inches)86%very high
April Weather13°C (56°F)119 mm (4.7 inches)84%very high
May Weather18°C (65°F)144 mm (5.6 inches)83%very high
June Weather22°C (72°F)114 mm (4.5 inches)83%extreme
July Weather25°C (77°F)60 mm (2.4 inches)79%very high
August Weather24°C (75°F)99 mm (3.9 inches)66%very high
September Weather21°C (70°F)112 mm (4.4 inches)68%very high
October Weather15°C (60°F)110 mm (4.3 inches)78%high
November Weather7°C (45°F)74 mm (2.9 inches)89%moderate
December Weather5°C (41°F)95 mm (3.7 inches)86%moderate

Compare Salem's Climate with Cities Worldwide