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December Weather in La Grande, United States

Last updated: June 24, 2025

In December, the average temperature in La Grande, United States hovers around -2°C (29°F). However, temperatures can dip as low as -26°C (-14°F) and peak at a maximum of 13°C (56°F). Expect 96 mm (3.8 in) of precipitation spread over approximately 16 days, while the air remains humid at 87% on average.

December Temperature in La Grande

In December in La Grande, the average temperature is -2°C (29°F), with a maximum reaching 13°C (56°F) and a minimum dropping as low as -26°C (-14°F). Travelers should prepare for a wide range of temperatures, ensuring they have both warm clothing for the coldest days and lighter layers for the milder temperatures.

December Weather in La Grande: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in La Grande, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Grande, December typically has an average temperature of -2°C (29°F), with highs reaching up to 13°C (56°F) and lows dropping to around -26°C (-14°F).
JanFebMarAprMayJunJulAugSepOctNovDec272735415058686657443529
Data source: Temperature data for La Grande 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 La Grande

In La Grande in December, the total precipitation amount is 96 mm (3.8 in) recorded over 16 days.

December Precipitation Trends in La Grande

The chart displays monthly precipitation patterns in La Grande, 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 La Grande, December typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec861308986774441635647996
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in La Grande

In La Grande in December humidity is 87%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it challenging to enjoy outdoor activities.

December Average Humidity in La Grande

This chart illustrates the average monthly humidity levels in La Grande, 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 La Grande is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in La Grande

In La Grande 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 La Grande, you can visit Hourly UV Index in La Grande.

Maximum UV Index Levels in La Grande for December

The chart shows the monthly maximum UV Index (UVI) for La Grande 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 La Grande typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357810101098542
Data source: La Grande 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 La Grande Compares to Other Months

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

This table compares monthly weather conditions in La Grande, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)86 mm (3.4 inches)86%moderate
February Weather-3°C (28°F)130 mm (5.1 inches)86%moderate
March Weather2°C (36°F)89 mm (3.5 inches)85%high
April Weather5°C (42°F)86 mm (3.4 inches)83%very high
May Weather10°C (50°F)77 mm (3.0 inches)77%very high
June Weather14°C (58°F)44 mm (1.7 inches)81%very high
July Weather20°C (68°F)3 mm (0.1 inches)76%very high
August Weather19°C (67°F)16 mm (0.6 inches)60%very high
September Weather14°C (57°F)35 mm (1.4 inches)58%very high
October Weather6°C (44°F)64 mm (2.5 inches)75%moderate
November Weather2°C (35°F)79 mm (3.1 inches)85%moderate
December Weather-2°C (29°F)96 mm (3.8 inches)87%low

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