Fontana (CA)
December
Weather in Fontana, California for December 2026
Your guide to Fontana weather in December - trends and predictions
In general, the average temperature in Fontana at the beginning of December is 20.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.7 °C by the end of December.
Fontana experiences moderate rainfall in December, with an average of 9 rainy days and a total precipitation of 144.7 mm.
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Temperatures
Rain 🌧️
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22
Dry days
9
Rainy days
0
Snow days
19°/10°
Temperatures
9 km/h
Avg max wind
43 %
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 |  Sunny | 19° /8° | 0 mm | 5 | |
| Dec. 2 | Sunny | 18° /8° | 0 mm | 5 | |
| Dec. 3 | Sunny | 19° /8° | 0 mm | 5 | |
| Dec. 4 | Sunny | 21° /10° | 0 mm | 5 | |
| Dec. 5 | Sunny | 23° /9° | 0 mm | 6 | |
| Dec. 6 | Sunny | 22° /12° | 0 mm | 6 | |
| Dec. 7 | Sunny | 21° /10° | 0 mm | 6 | |
| Dec. 8 | Sunny | 21° /10° | 0 mm | 5 | |
| Dec. 9 | Sunny | 20° /8° | 0 mm | 6 | |
| Dec. 10 | Sunny | 23° /8° | 0 mm | 6 | |
| Dec. 11 |  Overcast | 21° /12° | 0 mm | 5 | |
| Dec. 12 | Sunny | 18° /10° | 0 mm | 5 | |
| Dec. 13 | Sunny | 18° /8° | 0 mm | 5 | |
| Dec. 14 |  Cloudy | 20° /10° | 0 mm | 5 | |
| Dec. 15 | Sunny | 22° /10° | 0 mm | 6 | |
| Dec. 16 | Sunny | 23° /11° | 0 mm | 6 | |
| Dec. 17 | Cloudy | 23° /12° | 0 mm | 6 | |
| Dec. 18 | Sunny | 23° /14° | 0 mm | 6 | |
| Dec. 19 |  Light rain shower | 20° /13° | 2.4 mm | 5 | |
| Dec. 20 | Light rain shower | 20° /13° | 3.1 mm | 3 | |
| Dec. 21 | Light rain shower | 18° /12° | 2 mm | 3 | |
| Dec. 22 |  Light drizzle | 18° /12° | 1.3 mm | 3 | |
| Dec. 23 | Sunny | 17° /9° | 0.8 mm | 3 | |
| Dec. 24 | Overcast | 15° /8° | 85.4 mm | 3 | |
| Dec. 25 |  Partly cloudy | 15° /8° | 2.4 mm | 3 | |
| Dec. 26 | Partly cloudy | 14° /8° | 30.6 mm | 3 | |
| Dec. 27 | Overcast | 13° /7° | 0 mm | 3 | |
| Dec. 28 | Overcast | 16° /6° | 0 mm | 3 | |
| Dec. 29 | Overcast | 16° /8° | 0 mm | 3 | |
| Dec. 30 | Light rain shower | 14° /8° | 2.6 mm | 3 | |
| Dec. 31 | Light rain shower | 15° /8° | 14 mm | 2 | |
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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 19° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Fontana during December?
Significant rainfall exceeding 144.7 mm is expected in Fontana during December, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Fontana during December?
The average wind speed in Fontana during December is 9 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 💧
Typically, Fontana has 9 rainy days in December with a total of 144.7 mm of rainfall.
UV exposure in Fontana during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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