Proberta, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49 °F (low) to 74.5 °F (high). Annual precipitation averages 25.5 Inches. 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 | 37.9 °F | 56.0 °F | 4.66 in. |
| February | 40.0 °F | 60.4 °F | 4.12 in. |
| March | 42.7 °F | 65.5 °F | 3.44 in. |
| April | 45.7 °F | 70.3 °F | 1.58 in. |
| May | 52.6 °F | 79.4 °F | 1.26 in. |
| June | 59.4 °F | 88.0 °F | 0.54 in. |
| July | 62.8 °F | 94.4 °F | 0.03 in. |
| August | 61.0 °F | 93.1 °F | 0.06 in. |
| September | 57.0 °F | 89.2 °F | 0.26 in. |
| October | 49.9 °F | 78.1 °F | 1.1 in. |
| November | 41.8 °F | 64.4 °F | 2.93 in. |
| December | 37.4 °F | 55.4 °F | 5.53 in. |
| Annual | 49 °F | 74.5 °F | 25.51 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |