Morongo Valley, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 53.2 °F (low) to 78.9 °F (high). Annual precipitation averages 10.9 Inches. Morongo Valley 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 | 40.4 °F | 61.6 °F | 2.39 in. |
| February | 40.9 °F | 63.1 °F | 3.28 in. |
| March | 45.0 °F | 68.6 °F | 1.33 in. |
| April | 48.7 °F | 75.8 °F | 0.39 in. |
| May | 54.9 °F | 84.5 °F | 0.06 in. |
| June | 62.9 °F | 93.3 °F | 0.0 in. |
| July | 69.5 °F | 98.2 °F | 0.4 in. |
| August | 69.9 °F | 97.7 °F | 0.34 in. |
| September | 65.0 °F | 92.2 °F | 0.29 in. |
| October | 54.9 °F | 80.9 °F | 0.34 in. |
| November | 46.1 °F | 69.8 °F | 0.43 in. |
| December | 40.6 °F | 60.5 °F | 1.69 in. |
| Annual | 53.2 °F | 78.9 °F | 10.94 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 40-50 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 | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |