Calimesa, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.7 °C (low) to 25.6 °C (high). Annual precipitation averages 368.3 Millimeters. 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 | 5.2 °C | 17.7 °C | 75.69 mm |
| February | 4.7 °C | 17.9 °C | 90.42 mm |
| March | 5.8 °C | 20.1 °C | 61.21 mm |
| April | 7.2 °C | 22.9 °C | 23.88 mm |
| May | 9.6 °C | 26.3 °C | 12.7 mm |
| June | 12.4 °C | 31.2 °C | 2.54 mm |
| July | 16.3 °C | 35.1 °C | 2.79 mm |
| August | 16.7 °C | 35.4 °C | 2.29 mm |
| September | 14.9 °C | 33.1 °C | 5.59 mm |
| October | 11.3 °C | 27.6 °C | 13.72 mm |
| November | 7.3 °C | 22.1 °C | 24.38 mm |
| December | 4.8 °C | 17.4 °C | 53.09 mm |
| Annual | 9.7 °C | 25.6 °C | 368.3 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |