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December Weather in Pullman, United States

Last updated: June 24, 2025

In December, the average temperature in Pullman, United States hovers around 1°C (33°F). Expect chilly conditions, with minimums dropping to a brisk -18°C (0°F), while highs can reach a moderate 18°C (64°F). This month sees 85 mm (3.3 in) of precipitation spread over 15 days, coupled with a high average humidity of 90%, making it a particularly damp and cool time of year.

December Temperature in Pullman

In December in Pullman, the average temperature is 1°C (33°F). Maximum temperatures can reach 18°C (64°F), while minimums can drop as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures when visiting during this time.

December Weather in Pullman: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Pullman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pullman, December typically has an average temperature of 1°C (33°F), with highs reaching up to 18°C (64°F) and lows dropping to around -18°C (0°F).
JanFebMarAprMayJunJulAugSepOctNovDec333341485765747363494033
Data source: Temperature data for Pullman 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 Pullman

In Pullman in December, the total precipitation amount is 85 mm (3.3 in) spread over a period of 15 days.

December Precipitation Trends in Pullman

The chart displays monthly precipitation patterns in Pullman, 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 Pullman, December typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec7098685752273822648285
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Pullman

In Pullman in December humidity is 90%. With an average temperature of 1°C (33°F), this humidity feels like a bone-chilling dampness that seeps into your clothes, making every step outside feel heavy and uncomfortable for traveling.

December Average Humidity in Pullman

This chart illustrates the average monthly humidity levels in Pullman, 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 Pullman is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Pullman

In Pullman 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 Pullman, you can visit Hourly UV Index in Pullman.

Maximum UV Index Levels in Pullman for December

The chart shows the monthly maximum UV Index (UVI) for Pullman 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 Pullman typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457991097532
Data source: Pullman 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 Pullman Compares to Other Months

Weather in Pullman varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Pullman, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Pullman, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)70 mm (2.8 inches)89%low
February Weather0°C (33°F)98 mm (3.9 inches)89%moderate
March Weather5°C (41°F)68 mm (2.7 inches)87%moderate
April Weather9°C (48°F)57 mm (2.2 inches)84%high
May Weather14°C (57°F)52 mm (2.1 inches)77%very high
June Weather18°C (65°F)27 mm (1.1 inches)78%very high
July Weather24°C (75°F)3 mm (0.1 inches)77%very high
August Weather23°C (74°F)8 mm (0.3 inches)64%very high
September Weather17°C (63°F)22 mm (0.9 inches)62%high
October Weather9°C (49°F)64 mm (2.5 inches)79%moderate
November Weather4°C (40°F)82 mm (3.2 inches)87%moderate
December Weather1°C (33°F)85 mm (3.3 inches)90%low

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