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December Weather in Richland, United States

Last updated: June 24, 2025

In Richland, United States, the weather in December showcases an average temperature of 11°C (53°F). Expect a chill with minimum temperatures dipping to -5°C (23°F), while highs can reach up to 26°C (79°F). The region experiences approximately 130 mm (5.1 in) of precipitation spread over 11 days, culminating in an average humidity of about 88%.

December Temperature in Richland

In December in Richland, the average temperature is 11°C (53°F), with maximums reaching 26°C (79°F) and minimums dipping as low as -5°C (23°F). This wide range makes it essential for travelers to pack versatile clothing to ensure comfort during their stay.

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

The chart illustrates December temperature patterns in Richland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Richland, December typically has an average temperature of 11°C (53°F), with highs reaching up to 26°C (79°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec505661667479818178705752
Data source: Temperature data for 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 Richland

In Richland in December, the total precipitation amount is 130 mm (5.1 in) occurring over 11 days.

December Precipitation Trends in Richland

The chart displays monthly precipitation patterns in 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 Richland, December typically receives around 130 mm (5.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9911492115939410911810211559130
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Richland

In Richland in December humidity is 88%. With an average temperature of 11°C (53°F), this humidity feels like a heavy blanket wrapping around you, making travel feel sluggish and uncomfortable as you navigate the damp air.

December Average Humidity in Richland

This chart illustrates the average monthly humidity levels in 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 Richland is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Richland

In Richland in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Richland for better planning.

Maximum UV Index Levels in Richland for December

The chart shows the monthly maximum UV Index (UVI) for 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 Richland typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
Data source: 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 Richland Compares to Other Months

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

This table compares monthly weather conditions in Richland, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)99 mm (3.9 inches)85%moderate
February Weather13°C (57°F)114 mm (4.5 inches)82%high
March Weather16°C (61°F)92 mm (3.6 inches)80%very high
April Weather19°C (66°F)115 mm (4.5 inches)76%very high
May Weather23°C (75°F)93 mm (3.7 inches)73%extreme
June Weather26°C (79°F)94 mm (3.7 inches)74%extreme
July Weather27°C (82°F)109 mm (4.3 inches)80%extreme
August Weather27°C (81°F)118 mm (4.6 inches)79%extreme
September Weather26°C (79°F)102 mm (4.0 inches)83%very high
October Weather21°C (71°F)114 mm (4.5 inches)77%very high
November Weather14°C (57°F)59 mm (2.3 inches)84%high
December Weather11°C (53°F)130 mm (5.1 inches)88%moderate

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