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Weather in Grass Valley, California for December 2025

Your guide to Grass Valley weather in December - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Grass Valley during December is quite rare, with fewer than 2 snowy days on average.
    According to Grass Valley snow forecast for December 2025, 2 snowy days are expected in the next 2 weeks. The closest date with snow is Monday, December 22.

    • Temperatures

  • Until now, December 2025 in Grass Valley is slightly cooler than the historical average by -1.5 °F.

  • The forecast for the next days in Grass Valley predicts temperatures to be around 15 °F, close to the historical average.

  • In general, the average temperature in Grass Valley at the beginning of December is 15.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 9.1 °F by the end of December.

    • Rain 🌧️

  • 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.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
13°/5°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
64 %
Avg humidity

Grass Valley Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
15°
2
Sunny
17°
3
Sunny
16°
4
Sunny
14°
5
Cloudy
14°
6
Sunny
15°
7
Overcast
15°
8
Partly cloudy
15°
9
Sunny
16°
10
Sunny
16°
11
Sunny
21°
12
Sunny
20°
13
Sunny
20°
14
Sunny
19°
15
Sunny
18°
16
Partly cloudy
17°
17
Patchy rain possible
13°
18
Sunny
15°
19
Moderate rain
15°
20
Moderate rain
10°
21
Patchy rain possible
9°
22
Moderate rain
5°
23
Patchy rain possible
6°
24
Moderate or heavy rain shower
12°
25
Overcast
9°
26
Moderate or heavy rain shower
7°
27
Moderate or heavy rain shower
9°
28
Moderate or heavy rain shower
11°
29
Moderate or heavy rain shower
10°
30
Overcast
10°
31
Cloudy
8°

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

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Partly cloudy
Partly cloudy
 15° /5° 0 mm 0 cm
Dec. 2 Sunny
Sunny
 17° /8° 0 mm 0 cm
Dec. 3 Sunny
Sunny
 16° /6° 0 mm 0 cm
Dec. 4 Sunny
Sunny
 14° /6° 0 mm 0 cm
Dec. 5 Cloudy
Cloudy
 14° /7° 0 mm 0 cm
Dec. 6 Sunny
Sunny
 15° /8° 0 mm 0 cm
Dec. 7 Overcast
Overcast
 15° /8° 0 mm 0 cm
Dec. 8 Partly cloudy
Partly cloudy
 15° /8° 0 mm 0 cm
Dec. 9 Sunny
Sunny
 16° /7° 0 mm 0 cm
Dec. 10 Sunny
Sunny
 16° /9° 0 mm 0 cm
Dec. 11 Sunny
Sunny
 21° /11° 0 mm 0 cm
Dec. 12 Sunny
Sunny
 20° /12° 0 mm 0 cm
Dec. 13 Sunny
Sunny
 20° /10° 0 mm 0 cm
Dec. 14 Sunny
Sunny
 19° /9° 0 mm 0 cm
Dec. 15 Sunny
Sunny
 18° /9° 0 mm 0 cm
Dec. 16 Partly cloudy
Partly cloudy
 17° /10° 0 mm 0 cm
Dec. 17 Patchy rain possible
Patchy rain possible
 13° /9° 3.3 mm 0 cm
Dec. 18 Sunny
Sunny
 15° /8° 0 mm 0 cm
Dec. 19 Moderate rain
Moderate rain
 15° /8° 8 mm 0 cm
Dec. 20 Moderate rain
Moderate rain
 10° /6° 5.9 mm 0 cm
Dec. 21 Patchy rain possible
Patchy rain possible
 9° /2° 4.9 mm 0 cm
Dec. 22 Moderate rain
Moderate rain
 5° /2° 6.4 mm 0.3 cm
Dec. 23 Patchy rain possible
Patchy rain possible
 6° /0° 2.1 mm 1.1 cm
Dec. 24 Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /5° 66.8 mm 0 cm
Dec. 25 Overcast
Overcast
 9° /2° 0 mm 0 cm
Dec. 26 Moderate or heavy rain shower
Moderate or heavy rain shower
 7° /4° 48.7 mm 0 cm
Dec. 27 Moderate or heavy rain shower
Moderate or heavy rain shower
 9° /7° 31.8 mm 0 cm
Dec. 28 Moderate or heavy rain shower
Moderate or heavy rain shower
 11° /9° 15.8 mm 0 cm
Dec. 29 Moderate or heavy rain shower
Moderate or heavy rain shower
 10° /6° 75.6 mm 0 cm
Dec. 30 Overcast
Overcast
 10° /2° 1.1 mm 0 cm
Dec. 31 Cloudy
Cloudy
 8° /1° 0 mm 0 cm
Next
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.

Grass Valley snow forecast December 2025

Track daily snowfall levels and discover Grass Valley’s snowy potential this December ❄️

December rainfall patterns in Grass Valley

Explore the daily rainfall trends and prepare for Grass Valleys December weather 💧
Typically, Grass Valley has 13 rainy days in December with a total of 450.1 mm of rainfall.

UV exposure in Grass Valley during December

Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️

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Location coordinates Where is Grass Valley?

Get accurate weather forecasts for Grass Valley, located at latitude 39.219 and longitude -121.061. Stay updated with localized weather information tailored for Grass Valley.

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