Proberta, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.4 °C (low) to 23.6 °C (high). Annual precipitation averages 647.9 Millimeters. Proberta is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.3 °C | 13.3 °C | 118.36 mm |
| February | 4.4 °C | 15.8 °C | 104.65 mm |
| March | 5.9 °C | 18.6 °C | 87.38 mm |
| April | 7.6 °C | 21.3 °C | 40.13 mm |
| May | 11.4 °C | 26.3 °C | 32 mm |
| June | 15.2 °C | 31.1 °C | 13.72 mm |
| July | 17.1 °C | 34.7 °C | 0.76 mm |
| August | 16.1 °C | 33.9 °C | 1.52 mm |
| September | 13.9 °C | 31.8 °C | 6.6 mm |
| October | 9.9 °C | 25.6 °C | 27.94 mm |
| November | 5.4 °C | 18 °C | 74.42 mm |
| December | 3 °C | 13 °C | 140.46 mm |
| Annual | 9.4 °C | 23.6 °C | 647.94 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 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 |