Fontana (CA)
December
Weather in Fontana, California for December 2025
Your guide to Fontana weather in December - trends and predictions
In general, the average temperature in Fontana at the beginning of December is 21.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.9 °F by the end of December.
Fontana experiences moderate rainfall in December, with an average of 6 rainy days and a total precipitation of 19.1 mm.
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Temperatures
Rain 🌧️
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25
Dry days
6
Rainy days
0
Snow days
18°/9°
Temperatures
8 km/h
Avg max wind
39 %
Avg humidity
Fontana Weather December
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Temperatures trend during December in Fontana
See the weather trend as well as the moving average line
December weather in Fontana day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Partly cloudy | 20° /8° | 0 mm | 6 | |
| Dec. 2 |  Sunny | 19° /8° | 0 mm | 5 | |
| Dec. 3 | Sunny | 20° /9° | 0 mm | 5 | |
| Dec. 4 |  Overcast | 22° /11° | 0 mm | 6 | |
| Dec. 5 | Sunny | 24° /10° | 0 mm | 7 | |
| Dec. 6 | Sunny | 23° /12° | 0 mm | 6 | |
| Dec. 7 | Partly cloudy | 20° /11° | 0 mm | 6 | |
| Dec. 8 | Sunny | 20° /9° | 0 mm | 5 | |
| Dec. 9 | Sunny | 19° /7° | 0 mm | 6 | |
| Dec. 10 | Sunny | 20° /5° | 0 mm | 6 | |
| Dec. 11 | Overcast | 19° /10° | 0 mm | 4 | |
| Dec. 12 | Sunny | 16° /8° | 0 mm | 5 | |
| Dec. 13 | Sunny | 15° /5° | 0 mm | 5 | |
| Dec. 14 |  Cloudy | 16° /7° | 0 mm | 4 | |
| Dec. 15 | Partly cloudy | 19° /8° | 0 mm | 6 | |
| Dec. 16 | Sunny | 21° /10° | 0 mm | 6 | |
| Dec. 17 | Cloudy | 22° /11° | 0 mm | 6 | |
| Dec. 18 |  Patchy rain possible | 22° /14° | 0.1 mm | 5 | |
| Dec. 19 | Light rain shower | 19° /12° | 3.6 mm | 5 | |
| Dec. 20 | Light rain shower | 19° /13° | 4.6 mm | 5 | |
| Dec. 21 | Light rain shower | 18° /11° | 3 mm | 5 | |
| Dec. 22 |  Light drizzle | 16° /10° | 1.9 mm | 4 | |
| Dec. 23 | Sunny | 17° /8° | 0 mm | 5 | |
| Dec. 24 | Overcast | 15° /7° | 0 mm | 4 | |
| Dec. 25 | Partly cloudy | 16° /7° | 0 mm | 5 | |
| Dec. 26 | Partly cloudy | 15° /8° | 0 mm | 4 | |
| Dec. 27 | Overcast | 15° /8° | 0 mm | 4 | |
| Dec. 28 | Overcast | 18° /8° | 0 mm | 5 | |
| Dec. 29 | Overcast | 17° /10° | 0 mm | 5 | |
| Dec. 30 | Light rain shower | 16° /8° | 4 mm | 5 | |
| Dec. 31 | Light rain shower | 14° /7° | 2 mm | 4 | |
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Important Notice
Our weather forecast for Fontana 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 Fontana forecast closer to your planned date for the most up-to-date weather information.
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Fontana in December - FAQ
What are the expected maximum and minimum temperatures in Fontana during December?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Fontana during December?
Expect minimal rainfall in Fontana during December, with a total of 19.1 mm over approximately 6 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Fontana during December?
The average wind speed in Fontana during December is 8 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Fontana
Explore the daily rainfall trends and prepare for Fontanas December weather 💧
UV exposure in Fontana during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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