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December Weather in Trail, United States

Last updated: June 24, 2025

In December, the average temperature in Trail, United States hovers around 2°C (36°F). Expect chilly days, with minimums dipping to -8°C (17°F) and a pleasant maximum reaching 18°C (64°F). Rainfall is significant, totaling 133 mm (5.2 in) over approximately 16 days, while the air remains notably damp, with an average humidity of 87%. Prepare accordingly!

December Temperature in Trail

In December in Trail, the average temperature is 2°C (36°F). Maximums can reach 18°C (64°F) and minimums can be as low as -8°C (17°F). Pack accordingly for a mix of chilly days and a few milder ones, making sure to bring layers for your travels.

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

The chart illustrates December temperature patterns in Trail, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trail, December typically has an average temperature of 2°C (36°F), with highs reaching up to 18°C (64°F) and lows dropping to around -8°C (17°F).
JanFebMarAprMayJunJulAugSepOctNovDec373741475462696961504236
Data source: Temperature data for Trail 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 Trail

In Trail in December, the total precipitation amount is 133 mm (5.2 in) spread over 16 days.

December Precipitation Trends in Trail

The chart displays monthly precipitation patterns in Trail, 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 Trail, December typically receives around 133 mm (5.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec1461701201115931175472117133
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Trail

In Trail in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

December Average Humidity in Trail

This chart illustrates the average monthly humidity levels in Trail, 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 Trail is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Trail

In Trail 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 Trail, you can visit Hourly UV Index in Trail.

Maximum UV Index Levels in Trail for December

The chart shows the monthly maximum UV Index (UVI) for Trail 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 Trail typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478111110108642
Data source: Trail 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 Trail Compares to Other Months

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

This table compares monthly weather conditions in Trail, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)145 mm (5.7 inches)84%moderate
February Weather3°C (37°F)170 mm (6.7 inches)85%moderate
March Weather5°C (41°F)119 mm (4.7 inches)86%high
April Weather8°C (47°F)111 mm (4.4 inches)83%very high
May Weather12°C (54°F)59 mm (2.3 inches)83%extreme
June Weather17°C (62°F)31 mm (1.2 inches)83%extreme
July Weather21°C (70°F)1 mm (0.0 inches)78%very high
August Weather20°C (69°F)7 mm (0.3 inches)67%very high
September Weather16°C (61°F)54 mm (2.1 inches)66%very high
October Weather10°C (50°F)72 mm (2.8 inches)77%high
November Weather5°C (42°F)117 mm (4.6 inches)87%moderate
December Weather2°C (36°F)133 mm (5.2 inches)87%low

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