Grass Valley (CA)
December
Weather in Grass Valley, California for December 2025
Your guide to Grass Valley weather in December - trends and predictions
In general, the average temperature in Grass Valley at the beginning of December is 16.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 9.1 °F by the end of December.
The climate of Grass Valley in December is notably wet, with an average of 13 rainy days, and a total of 450.1 mm of precipitation.
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Temperatures
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18
Dry days
13
Rainy days
0
Snow days
13°/5°
Temperatures
12 km/h
Avg max wind
64 %
Avg humidity
Grass Valley Weather December
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Temperatures trend during December in Grass Valley
See the weather trend as well as the moving average line
December weather in Grass Valley day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Partly cloudy | 17° /4° | 0 mm | 5 | |
| Dec. 2 |  Sunny | 17° /7° | 0 mm | 5 | |
| Dec. 3 | Sunny | 16° /6° | 0 mm | 5 | |
| Dec. 4 | Sunny | 17° /7° | 0 mm | 5 | |
| Dec. 5 |  Cloudy | 16° /6° | 0 mm | 4 | |
| Dec. 6 | Sunny | 16° /7° | 0 mm | 5 | |
| Dec. 7 |  Overcast | 16° /7° | 0 mm | 4 | |
| Dec. 8 | Partly cloudy | 16° /7° | 0 mm | 5 | |
| Dec. 9 | Sunny | 16° /3° | 0 mm | 5 | |
| Dec. 10 | Sunny | 14° /3° | 0 mm | 4 | |
| Dec. 11 | Overcast | 15° /5° | 0 mm | 4 | |
| Dec. 12 |  Moderate or heavy rain shower | 7° /3° | 36.4 mm | 2 | |
| Dec. 13 |  Heavy rain at times | 9° /4° | 8.9 mm | 2 | |
| Dec. 14 | Moderate or heavy rain shower | 8° /4° | 82.6 mm | 2 | |
| Dec. 15 | Partly cloudy | 9° /-1° | 0 mm | 3 | |
| Dec. 16 | Moderate or heavy rain shower | 9° /5° | 26.5 mm | 2 | |
| Dec. 17 | Partly cloudy | 14° /5° | 0 mm | 4 | |
| Dec. 18 | Overcast | 16° /5° | 0 mm | 4 | |
| Dec. 19 | Sunny | 17° /6° | 0 mm | 5 | |
| Dec. 20 | Cloudy | 17° /8° | 0 mm | 4 | |
| Dec. 21 | Moderate or heavy rain shower | 13° /8° | 35.3 mm | 3 | |
| Dec. 22 | Heavy rain at times | 14° /9° | 15.4 mm | 3 | |
| Dec. 23 | Moderate rain at times | 15° /11° | 5.3 mm | 4 | |
| Dec. 24 | Moderate or heavy rain shower | 12° /5° | 66.8 mm | 3 | |
| Dec. 25 | Overcast | 9° /2° | 0 mm | 2 | |
| Dec. 26 | Moderate or heavy rain shower | 7° /4° | 48.7 mm | 2 | |
| Dec. 27 | Moderate or heavy rain shower | 9° /7° | 31.8 mm | 2 | |
| Dec. 28 | Moderate or heavy rain shower | 11° /9° | 15.8 mm | 3 | |
| Dec. 29 | Moderate or heavy rain shower | 10° /6° | 75.6 mm | 3 | |
| Dec. 30 | Overcast | 10° /2° | 1.1 mm | 3 | |
| Dec. 31 | Cloudy | 8° /1° | 0 mm | 2 | |
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Important Notice
Our weather forecast for Grass Valley in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Grass Valley forecast closer to your planned date for the most up-to-date weather information.
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Grass Valley in December - FAQ
What are the expected maximum and minimum temperatures in Grass Valley during December?
During December, expect a variety of temperatures with highs around 13° and lows near 5°, suitable for diverse activities and preferences.
How much rainfall should be expected in Grass Valley during December?
Significant rainfall exceeding 450.1 mm is expected in Grass Valley during December, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Grass Valley during December?
The average wind speed in Grass Valley during December is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Grass Valley
Explore the daily rainfall trends and prepare for Grass Valleys December weather 💧
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