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December Weather in West Richland, United States

Last updated: June 24, 2025

In West Richland, United States, the average temperature in December hovers around 2°C (36°F), with a minimum that can dip to -9°C (17°F) and a maximum reaching 20°C (68°F). Expect 30 mm (1.2 in) of precipitation over about 6 days, accompanied by a high average humidity of 86%.

December Temperature in West Richland

In December in West Richland, the average temperature is 2°C (36°F). Maximums can reach 20°C (68°F), while minimums can drop to as low as -9°C (17°F). Be prepared for a wide range of temperatures when traveling to West Richland during this time.

December Weather in West Richland: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in West Richland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In West Richland, December typically has an average temperature of 2°C (36°F), with highs reaching up to 20°C (68°F) and lows dropping to around -9°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec353646566674828069544236
Data source: Temperature data for West Richland 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 West Richland

In West Richland in December, the total precipitation amount is 30 mm (1.2 in) spread across 6 days.

December Precipitation Trends in West Richland

The chart displays monthly precipitation patterns in West Richland, 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 West Richland, December typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec36392622137038233030
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in West Richland

In West Richland in December, humidity is 86%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm for travel.

December Average Humidity in West Richland

This chart illustrates the average monthly humidity levels in West Richland, 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 West Richland is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%82%77%79%77%62%60%80%87%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in West Richland

In West Richland 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 West Richland, you can visit Hourly UV Index in West Richland.

Maximum UV Index Levels in West Richland for December

The chart shows the monthly maximum UV Index (UVI) for West Richland 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 West Richland typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2356991097532
Data source: West Richland 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 West Richland Compares to Other Months

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

This table compares monthly weather conditions in West Richland, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)36 mm (1.4 inches)85%low
February Weather2°C (37°F)39 mm (1.5 inches)86%moderate
March Weather8°C (47°F)26 mm (1.0 inches)86%moderate
April Weather13°C (56°F)22 mm (0.9 inches)82%high
May Weather19°C (67°F)13 mm (0.5 inches)77%very high
June Weather24°C (75°F)7 mm (0.3 inches)79%very high
July Weather28°C (82°F)0 mm (0.0 inches)77%very high
August Weather27°C (80°F)3 mm (0.1 inches)62%very high
September Weather20°C (69°F)8 mm (0.3 inches)60%high
October Weather12°C (54°F)23 mm (0.9 inches)80%moderate
November Weather6°C (42°F)30 mm (1.2 inches)87%moderate
December Weather2°C (36°F)30 mm (1.2 inches)86%low

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