Chico, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49.2 °F (low) to 74.8 °F (high). Annual precipitation averages 27.1 Inches. Chico is located in USDA Plant Hardiness Zone 9a. 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 | 38.1 °F | 55.9 °F | 5.02 in. |
| February | 40.3 °F | 60.9 °F | 4.46 in. |
| March | 43.0 °F | 65.8 °F | 3.82 in. |
| April | 46.0 °F | 71.8 °F | 2.09 in. |
| May | 52.7 °F | 80.1 °F | 1.35 in. |
| June | 59.0 °F | 88.0 °F | 0.59 in. |
| July | 62.7 °F | 93.9 °F | 0.01 in. |
| August | 61.0 °F | 92.9 °F | 0.11 in. |
| September | 57.2 °F | 89.3 °F | 0.22 in. |
| October | 50.3 °F | 79.0 °F | 1.63 in. |
| November | 42.1 °F | 64.5 °F | 2.38 in. |
| December | 37.9 °F | 55.7 °F | 5.39 in. |
| Annual | 49.2 °F | 74.8 °F | 27.07 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |