Calimesa, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 49.4 °F (low) to 78 °F (high). Annual precipitation averages 14.5 Inches. Calimesa is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.3 °F | 63.9 °F | 2.98 in. |
| February | 40.5 °F | 64.3 °F | 3.56 in. |
| March | 42.4 °F | 68.1 °F | 2.41 in. |
| April | 45.0 °F | 73.2 °F | 0.94 in. |
| May | 49.3 °F | 79.3 °F | 0.5 in. |
| June | 54.3 °F | 88.1 °F | 0.1 in. |
| July | 61.4 °F | 95.1 °F | 0.11 in. |
| August | 62.1 °F | 95.8 °F | 0.09 in. |
| September | 58.9 °F | 91.5 °F | 0.22 in. |
| October | 52.4 °F | 81.6 °F | 0.54 in. |
| November | 45.1 °F | 71.7 °F | 0.96 in. |
| December | 40.6 °F | 63.4 °F | 2.09 in. |
| Annual | 49.4 °F | 78 °F | 14.5 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |