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December Weather in Tumwater, United States

Last updated: June 24, 2025

In December, the average temperature in Tumwater, United States is a chilly 5°C (42°F), with a minimum dropping to -5°C (23°F) and a maximum peaking at 13°C (56°F). Expect 203 mm (8.0 in) of precipitation spread over 18 days, contributing to a high average humidity of 87%. Be prepared for wet and cool conditions!

December Temperature in Tumwater

In December in Tumwater, the average temperature is 5°C (42°F), with maximums reaching 13°C (56°F) and minimums dropping as low as -5°C (23°F). Travelers should be prepared for chilly conditions and dress in layers to enjoy their adventures.

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

The chart illustrates December temperature patterns in Tumwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tumwater, December typically has an average temperature of 5°C (42°F), with highs reaching up to 13°C (56°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145505661656661524641
Data source: Temperature data for Tumwater 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 Tumwater

In Tumwater in December, the precipitation amount is 203 mm (8.0 in) over the course of 18 days.

December Precipitation Trends in Tumwater

The chart displays monthly precipitation patterns in Tumwater, 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 Tumwater, December typically receives around 203 mm (8.0 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec197155134117655191288134192203
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tumwater

In Tumwater in December humidity is 87%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and travel less inviting as the air becomes heavy and oppressive.

December Average Humidity in Tumwater

This chart illustrates the average monthly humidity levels in Tumwater, 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 Tumwater is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Tumwater

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

Maximum UV Index Levels in Tumwater for December

The chart shows the monthly maximum UV Index (UVI) for Tumwater 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 Tumwater typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Tumwater 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 Tumwater Compares to Other Months

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

This table compares monthly weather conditions in Tumwater, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)197 mm (7.8 inches)86%low
February Weather5°C (41°F)155 mm (6.1 inches)84%moderate
March Weather7°C (45°F)134 mm (5.3 inches)85%moderate
April Weather10°C (50°F)117 mm (4.6 inches)83%high
May Weather13°C (56°F)65 mm (2.6 inches)84%very high
June Weather16°C (61°F)51 mm (2.0 inches)84%very high
July Weather18°C (65°F)9 mm (0.4 inches)82%very high
August Weather19°C (66°F)12 mm (0.5 inches)73%very high
September Weather16°C (61°F)88 mm (3.5 inches)74%high
October Weather11°C (52°F)133 mm (5.3 inches)83%moderate
November Weather8°C (46°F)192 mm (7.5 inches)86%moderate
December Weather5°C (42°F)203 mm (8.0 inches)87%low

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