Chico, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.6 °C (low) to 23.8 °C (high). Annual precipitation averages 687.6 Millimeters. 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 | 3.4 °C | 13.3 °C | 127.51 mm |
| February | 4.6 °C | 16.1 °C | 113.28 mm |
| March | 6.1 °C | 18.8 °C | 97.03 mm |
| April | 7.8 °C | 22.1 °C | 53.09 mm |
| May | 11.5 °C | 26.7 °C | 34.29 mm |
| June | 15 °C | 31.1 °C | 14.99 mm |
| July | 17.1 °C | 34.4 °C | 0.25 mm |
| August | 16.1 °C | 33.8 °C | 2.79 mm |
| September | 14 °C | 31.8 °C | 5.59 mm |
| October | 10.2 °C | 26.1 °C | 41.4 mm |
| November | 5.6 °C | 18.1 °C | 60.45 mm |
| December | 3.3 °C | 13.2 °C | 136.91 mm |
| Annual | 9.6 °C | 23.8 °C | 687.58 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |