Whitmore, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 46.9 °F (low) to 72 °F (high). Annual precipitation averages 40.7 Inches. Whitmore is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.4 °F | 53.9 °F | 7.02 in. |
| February | 37.0 °F | 56.2 °F | 5.64 in. |
| March | 39.1 °F | 60.8 °F | 6.08 in. |
| April | 42.0 °F | 66.3 °F | 3.55 in. |
| May | 48.7 °F | 75.9 °F | 2.47 in. |
| June | 55.7 °F | 86.1 °F | 1.08 in. |
| July | 61.8 °F | 95.3 °F | 0.12 in. |
| August | 60.6 °F | 94.3 °F | 0.2 in. |
| September | 56.5 °F | 88.0 °F | 0.63 in. |
| October | 48.6 °F | 75.0 °F | 2.28 in. |
| November | 40.6 °F | 60.2 °F | 4.04 in. |
| December | 35.8 °F | 52.4 °F | 7.56 in. |
| Annual | 46.9 °F | 72 °F | 40.67 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 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 |