Colton, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 52.3 °F (low) to 79.7 °F (high). Annual precipitation averages 11.6 Inches. Colton is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.9 °F | 67.4 °F | 2.57 in. |
| February | 44.0 °F | 67.7 °F | 2.88 in. |
| March | 46.7 °F | 71.1 °F | 1.93 in. |
| April | 49.5 °F | 75.7 °F | 0.68 in. |
| May | 54.1 °F | 80.5 °F | 0.27 in. |
| June | 58.2 °F | 87.8 °F | 0.08 in. |
| July | 63.1 °F | 94.6 °F | 0.05 in. |
| August | 63.9 °F | 95.8 °F | 0.05 in. |
| September | 61.3 °F | 92.4 °F | 0.12 in. |
| October | 54.6 °F | 83.0 °F | 0.48 in. |
| November | 47.1 °F | 74.2 °F | 0.7 in. |
| December | 42.1 °F | 66.6 °F | 1.75 in. |
| Annual | 52.3 °F | 79.7 °F | 11.56 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |