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December Weather in Bellevue, United States

Last updated: June 24, 2025

In Bellevue, United States, the average temperature in December hovers around 1°C (34°F). Expect a minimum of -21°C (-6°F) and a maximum of 20°C (69°F). During this month, the area experiences approximately 54 mm (2.1 in) of precipitation over 6 days, with an average humidity of 84%.

December Temperature in Bellevue

In December in Bellevue, the average temperature is 1°C (34°F), with maximums reaching 20°C (69°F) and minimums dropping to as low as -21°C (-6°F). This diverse temperature range makes it essential for travelers to pack accordingly, ensuring comfort during both the chilly and mild moments of their journey.

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 1°C (34°F), with highs reaching up to 20°C (69°F) and lows dropping to around -21°C (-6°F).
JanFebMarAprMayJunJulAugSepOctNovDec262941516474777470564034
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 total precipitation amount is 54 mm (2.1 in) over the course of 6 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 54 mm (2.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec606711111516815910573741305754
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 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
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 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 Bellevue, you can visit Hourly UV Index in Bellevue.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35789111098642
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-3°C (27°F)60 mm (2.4 inches)82%moderate
February Weather-2°C (29°F)67 mm (2.6 inches)83%moderate
March Weather5°C (42°F)111 mm (4.4 inches)84%high
April Weather10°C (51°F)115 mm (4.5 inches)85%very high
May Weather18°C (64°F)168 mm (6.6 inches)79%very high
June Weather23°C (74°F)159 mm (6.2 inches)82%extreme
July Weather25°C (77°F)105 mm (4.1 inches)80%very high
August Weather24°C (75°F)73 mm (2.9 inches)81%very high
September Weather21°C (70°F)74 mm (2.9 inches)80%very high
October Weather13°C (56°F)130 mm (5.1 inches)82%high
November Weather4°C (40°F)57 mm (2.3 inches)88%moderate
December Weather1°C (34°F)54 mm (2.1 inches)84%low

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