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December Weather in Bellingham, United States

Last updated: June 24, 2025

In December, the average temperature in Bellingham, United States hovers around 5°C (41°F). Be prepared for a range that can drop as low as -12°C (10°F) and rise to a maximum of 12°C (55°F). With an average precipitation of 227 mm (8.9 in) spread over 18 days, it's wise to keep an umbrella handy. Additionally, expect high humidity levels at around 87%, making the air feel cooler and more crisp.

December Temperature in Bellingham

In December in Bellingham, the average temperature is 5°C (41°F), with maximums reaching up to 12°C (55°F) and minimums dropping as low as -12°C (10°F). Be prepared for chilly weather, and pack warm layers if you're planning to visit!

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

The chart illustrates December temperature patterns in Bellingham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bellingham, December typically has an average temperature of 5°C (41°F), with highs reaching up to 12°C (55°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec413943485358636460514641
Data source: Temperature data for Bellingham 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 Bellingham

In Bellingham in December, the precipitation amount is 227 mm (8.9 in) accumulated over 18 days.

December Precipitation Trends in Bellingham

The chart displays monthly precipitation patterns in Bellingham, 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 Bellingham, December typically receives around 227 mm (8.9 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec19918515612776582720125186261227
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Bellingham

In Bellingham 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 Bellingham

This chart illustrates the average monthly humidity levels in Bellingham, 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 Bellingham is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%86%86%81%83%84%77%76%88%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Bellingham

In Bellingham in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Bellingham.

Maximum UV Index Levels in Bellingham for December

The chart shows the monthly maximum UV Index (UVI) for Bellingham 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 Bellingham typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Bellingham 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 Bellingham Compares to Other Months

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

This table compares monthly weather conditions in Bellingham, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)199 mm (7.8 inches)86%low
February Weather4°C (39°F)185 mm (7.3 inches)85%moderate
March Weather6°C (44°F)156 mm (6.2 inches)86%moderate
April Weather9°C (48°F)127 mm (5.0 inches)86%high
May Weather12°C (53°F)76 mm (3.0 inches)81%very high
June Weather15°C (59°F)58 mm (2.3 inches)83%very high
July Weather17°C (63°F)27 mm (1.1 inches)84%very high
August Weather18°C (64°F)19 mm (0.8 inches)77%very high
September Weather15°C (60°F)125 mm (4.9 inches)76%high
October Weather11°C (51°F)186 mm (7.3 inches)88%moderate
November Weather8°C (46°F)261 mm (10.3 inches)87%low
December Weather5°C (41°F)227 mm (8.9 inches)87%low

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