Greenville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 1.8 °C (low) to 19.2 °C (high). Annual precipitation averages 1027.9 Millimeters. 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 | -3.8 °C | 7.9 °C | 193.55 mm |
| February | -3.2 °C | 10.6 °C | 183.64 mm |
| March | -1.3 °C | 13.7 °C | 152.91 mm |
| April | 0.3 °C | 16.4 °C | 74.93 mm |
| May | 3.7 °C | 22.1 °C | 50.04 mm |
| June | 7.2 °C | 27.4 °C | 18.8 mm |
| July | 9.6 °C | 31.7 °C | 4.06 mm |
| August | 8.7 °C | 31.8 °C | 4.06 mm |
| September | 5.3 °C | 28.2 °C | 9.65 mm |
| October | 1.3 °C | 20.9 °C | 52.83 mm |
| November | -1.5 °C | 12.2 °C | 93.73 mm |
| December | -4.2 °C | 7.2 °C | 189.74 mm |
| Annual | 1.8 °C | 19.2 °C | 1027.94 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |