Greenville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 35.3 °F (low) to 66.5 °F (high). Annual precipitation averages 40.5 Inches. Greenville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.2 °F | 46.3 °F | 7.62 in. |
| February | 26.3 °F | 51.0 °F | 7.23 in. |
| March | 29.7 °F | 56.6 °F | 6.02 in. |
| April | 32.5 °F | 61.6 °F | 2.95 in. |
| May | 38.7 °F | 71.7 °F | 1.97 in. |
| June | 45.0 °F | 81.4 °F | 0.74 in. |
| July | 49.3 °F | 89.0 °F | 0.16 in. |
| August | 47.6 °F | 89.2 °F | 0.16 in. |
| September | 41.6 °F | 82.7 °F | 0.38 in. |
| October | 34.3 °F | 69.6 °F | 2.08 in. |
| November | 29.3 °F | 54.0 °F | 3.69 in. |
| December | 24.5 °F | 45.0 °F | 7.47 in. |
| Annual | 35.3 °F | 66.5 °F | 40.47 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |