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December Weather in Richland, United States

Last updated: June 24, 2025

In December, the average temperature in Richland, United States hovers around 5°C (41°F). Expect a wide range, with minimums dipping to -14°C (7°F) and maximums soaring to 25°C (77°F). This month brings 52 mm (2.1 in) of precipitation over approximately 7 days, accompanied by a relatively high average humidity of 87%.

December Temperature in Richland

In December in Richland, the average temperature is 5°C (41°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop as low as -14°C (7°F). Be prepared for a wide range of temperatures during your travels.

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 5°C (41°F), with highs reaching up to 25°C (77°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748556675797672594641
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 precipitation amount is 52 mm (2.1 in) over the course of 7 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 52 mm (2.1 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec7981130148165959891511346452
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 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
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 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 Richland, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather1°C (34°F)79 mm (3.1 inches)81%moderate
February Weather3°C (37°F)80 mm (3.2 inches)78%high
March Weather9°C (49°F)130 mm (5.1 inches)76%high
April Weather13°C (55°F)148 mm (5.8 inches)78%very high
May Weather19°C (66°F)165 mm (6.5 inches)83%very high
June Weather24°C (76°F)95 mm (3.7 inches)83%extreme
July Weather26°C (79°F)98 mm (3.9 inches)78%extreme
August Weather25°C (76°F)91 mm (3.6 inches)68%very high
September Weather22°C (73°F)51 mm (2.0 inches)64%very high
October Weather15°C (59°F)134 mm (5.3 inches)70%high
November Weather8°C (46°F)64 mm (2.5 inches)83%moderate
December Weather5°C (41°F)52 mm (2.1 inches)87%moderate

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