Mountain Mesa, California has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 9 °C (low) to 24.6 °C (high). Annual precipitation averages 328.4 Millimeters. Mountain Mesa is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 15.1 °C | 67.56 mm |
| February | 2.7 °C | 16.1 °C | 71.88 mm |
| March | 4.6 °C | 18.6 °C | 54.86 mm |
| April | 6.9 °C | 21.3 °C | 19.3 mm |
| May | 11 °C | 26.2 °C | 10.67 mm |
| June | 15.3 °C | 31.8 °C | 4.32 mm |
| July | 18.4 °C | 36.7 °C | 4.32 mm |
| August | 17.6 °C | 36.5 °C | 4.06 mm |
| September | 15.1 °C | 32.7 °C | 2.29 mm |
| October | 9.4 °C | 26.2 °C | 11.43 mm |
| November | 4.4 °C | 19.6 °C | 36.58 mm |
| December | 0.9 °C | 14.5 °C | 41.15 mm |
| Annual | 9 °C | 24.6 °C | 328.42 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BWh - Hot Desert Climate |