Chester, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 32.3 °F (low) to 62.9 °F (high). Annual precipitation averages 33 Inches. Chester is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.4 °F | 43.5 °F | 5.97 in. |
| February | 22.6 °F | 46.8 °F | 5.28 in. |
| March | 25.9 °F | 51.7 °F | 5.04 in. |
| April | 29.3 °F | 57.3 °F | 2.53 in. |
| May | 35.7 °F | 67.0 °F | 1.85 in. |
| June | 41.5 °F | 77.2 °F | 0.75 in. |
| July | 46.6 °F | 86.4 °F | 0.35 in. |
| August | 45.5 °F | 85.4 °F | 0.2 in. |
| September | 39.5 °F | 79.0 °F | 0.32 in. |
| October | 31.9 °F | 66.3 °F | 1.69 in. |
| November | 26.2 °F | 51.2 °F | 3.23 in. |
| December | 21.4 °F | 42.4 °F | 5.8 in. |
| Annual | 32.3 °F | 62.9 °F | 33.01 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |