Average temperatures within Rancho Cucamonga during December is 11. Through the month the highs are about 18 and low around 6 degrees. Find more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 11 |
| High Temperature | 18 |
| Low Temperature | 6 |
| Sunshine Per Day | 8 |
Useful Links: Rancho Cucamonga Weather: Average Weather & Yearly Climate