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December Weather in Cottage Grove, United States

Last updated: June 24, 2025

In Cottage Grove, United States, the average temperature in December hovers around 5°C (40°F). Expect cool conditions, with minimums plunging to -6°C (22°F) and maximums reaching a mild 19°C (66°F). Be prepared for an average precipitation of 177 mm (7.0 in) spread over 18 rainy days, contributing to the high humidity of 87%.

December Temperature in Cottage Grove

In December in Cottage Grove, the average temperature is 5°C (40°F). The maximum can reach 19°C (66°F) and the minimum can be as low as -6°C (22°F). Travelers should prepare for a range of temperatures, from chilly mornings to pleasantly warm afternoons.

December Weather in Cottage Grove: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Cottage Grove, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cottage Grove, December typically has an average temperature of 5°C (40°F), with highs reaching up to 19°C (66°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec414044495562686963524540
Data source: Temperature data for Cottage Grove 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 Cottage Grove

In Cottage Grove in December, the precipitation amount is 177 mm (7.0 in) spread over 18 days.

December Precipitation Trends in Cottage Grove

The chart displays monthly precipitation patterns in Cottage Grove, 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 Cottage Grove, December typically receives around 177 mm (7.0 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec16220915615272512788102144177
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Cottage Grove

In Cottage Grove in December, humidity is 87%. With an average temperature of 5°C (40°F), this humidity feels like a damp chill that wraps around you, making outdoor excursions less enjoyable and requiring extra layers to stay comfortable while exploring.

December Average Humidity in Cottage Grove

This chart illustrates the average monthly humidity levels in Cottage Grove, 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 Cottage Grove 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 Cottage Grove

In Cottage Grove 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 Cottage Grove, you can visit Hourly UV Index in Cottage Grove.

Maximum UV Index Levels in Cottage Grove for December

The chart shows the monthly maximum UV Index (UVI) for Cottage Grove 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 Cottage Grove typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: Cottage Grove 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 Cottage Grove Compares to Other Months

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

This table compares monthly weather conditions in Cottage Grove, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)162 mm (6.4 inches)84%low
February Weather5°C (40°F)209 mm (8.2 inches)85%moderate
March Weather7°C (44°F)156 mm (6.1 inches)86%high
April Weather10°C (49°F)152 mm (6.0 inches)83%high
May Weather13°C (56°F)72 mm (2.8 inches)83%very high
June Weather17°C (62°F)51 mm (2.0 inches)83%very high
July Weather20°C (69°F)2 mm (0.1 inches)78%very high
August Weather21°C (69°F)7 mm (0.3 inches)67%very high
September Weather17°C (63°F)88 mm (3.4 inches)66%very high
October Weather11°C (52°F)102 mm (4.0 inches)77%moderate
November Weather7°C (45°F)144 mm (5.7 inches)87%moderate
December Weather5°C (40°F)177 mm (7.0 inches)87%low

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