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December Weather in Lynden, United States

Last updated: June 24, 2025

In December, the average temperature in Lynden, United States hovers around 4°C (39°F), with chilly lows reaching -15°C (6°F) and mild highs peaking at 13°C (56°F). Expect 245 mm (9.6 in) of precipitation spread over 18 days, contributing to the region's high humidity, which averages at a brisk 87%.

December Temperature in Lynden

In December in Lynden, the average temperature is 4°C (39°F), with maximums reaching up to 13°C (56°F) and minimums dropping as low as -15°C (6°F). Be prepared for chilly weather and pack accordingly to enjoy your visit!

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

The chart illustrates December temperature patterns in Lynden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lynden, December typically has an average temperature of 4°C (39°F), with highs reaching up to 13°C (56°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec393844505661666661504539
Data source: Temperature data for Lynden 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 Lynden

In Lynden in December, the precipitation amount is 245 mm (9.6 in) occurring over the span of 18 days.

December Precipitation Trends in Lynden

The chart displays monthly precipitation patterns in Lynden, 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 Lynden, December typically receives around 245 mm (9.6 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec22419218015183733825168219297245
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lynden

In Lynden in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

December Average Humidity in Lynden

This chart illustrates the average monthly humidity levels in Lynden, 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 Lynden 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 Lynden

In Lynden 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 Lynden.

Maximum UV Index Levels in Lynden for December

The chart shows the monthly maximum UV Index (UVI) for Lynden 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 Lynden typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235678986421
Data source: Lynden 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 Lynden Compares to Other Months

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

This table compares monthly weather conditions in Lynden, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)223 mm (8.8 inches)86%low
February Weather3°C (38°F)192 mm (7.5 inches)85%moderate
March Weather7°C (44°F)180 mm (7.1 inches)86%moderate
April Weather10°C (50°F)151 mm (5.9 inches)86%high
May Weather14°C (57°F)83 mm (3.3 inches)81%high
June Weather16°C (62°F)73 mm (2.9 inches)83%very high
July Weather19°C (66°F)38 mm (1.5 inches)84%very high
August Weather19°C (67°F)25 mm (1.0 inches)77%very high
September Weather16°C (61°F)168 mm (6.6 inches)76%high
October Weather10°C (51°F)219 mm (8.6 inches)88%moderate
November Weather7°C (45°F)297 mm (11.7 inches)87%low
December Weather4°C (39°F)245 mm (9.6 inches)87%low

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