Whitmore, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 8.3 °C (low) to 22.3 °C (high). Annual precipitation averages 1033 Millimeters. 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 | 2.4 °C | 12.2 °C | 178.31 mm |
| February | 2.8 °C | 13.4 °C | 143.26 mm |
| March | 3.9 °C | 16 °C | 154.43 mm |
| April | 5.6 °C | 19.1 °C | 90.17 mm |
| May | 9.3 °C | 24.4 °C | 62.74 mm |
| June | 13.2 °C | 30.1 °C | 27.43 mm |
| July | 16.6 °C | 35.2 °C | 3.05 mm |
| August | 15.9 °C | 34.6 °C | 5.08 mm |
| September | 13.6 °C | 31.1 °C | 16 mm |
| October | 9.2 °C | 23.9 °C | 57.91 mm |
| November | 4.8 °C | 15.7 °C | 102.62 mm |
| December | 2.1 °C | 11.3 °C | 192.02 mm |
| Annual | 8.3 °C | 22.3 °C | 1033.02 mm |
| 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 : -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 |