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December Weather in Bellevue, United States

Last updated: June 24, 2025

In December, the average temperature in Bellevue, United States hovers around -7°C (20°F), with extremes reaching as low as -25°C (-13°F) and peaking at 10°C (51°F). Expect 45 mm (1.8 in) of precipitation over approximately 9 days, and prepare for a high average humidity of 87%.

December Temperature in Bellevue

In December in Bellevue, the average temperature is -7°C (20°F). Maximum can reach 10°C (51°F) and minimum can be as low as -25°C (-13°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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

The chart illustrates December temperature patterns in Bellevue, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bellevue, December typically has an average temperature of -7°C (20°F), with highs reaching up to 10°C (51°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec192130374758686556413019
Data source: Temperature data for Bellevue 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 Bellevue

In Bellevue in December, the precipitation amount is 45 mm (1.8 in) spread over 9 days.

December Precipitation Trends in Bellevue

The chart displays monthly precipitation patterns in Bellevue, 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 Bellevue, December typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec58804943522551721344345
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bellevue

In Bellevue in December humidity is 87%. With an average temperature of -7°C (20°F), this humidity feels like a biting chill that penetrates through layers of clothing, making outdoor exploration daunting and uncomfortable for travelers.

December Average Humidity in Bellevue

This chart illustrates the average monthly humidity levels in Bellevue, 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 Bellevue is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%85%76%66%62%53%42%46%64%83%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bellevue

In Bellevue 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 Bellevue, you can check the information here.

Maximum UV Index Levels in Bellevue for December

The chart shows the monthly maximum UV Index (UVI) for Bellevue 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 Bellevue typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111211109643
Data source: Bellevue 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 Bellevue Compares to Other Months

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

This table compares monthly weather conditions in Bellevue, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)58 mm (2.3 inches)91%moderate
February Weather-6°C (22°F)80 mm (3.1 inches)92%moderate
March Weather-1°C (30°F)49 mm (1.9 inches)85%very high
April Weather3°C (38°F)43 mm (1.7 inches)76%very high
May Weather8°C (47°F)52 mm (2.0 inches)66%extreme
June Weather15°C (58°F)25 mm (1.0 inches)62%extreme
July Weather20°C (68°F)5 mm (0.2 inches)53%extreme
August Weather19°C (66°F)17 mm (0.7 inches)42%very high
September Weather13°C (56°F)21 mm (0.8 inches)46%very high
October Weather5°C (41°F)34 mm (1.3 inches)64%high
November Weather-1°C (30°F)43 mm (1.7 inches)83%moderate
December Weather-7°C (20°F)45 mm (1.8 inches)87%moderate

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