Morongo Valley, California has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 11.8 °C (low) to 26 °C (high). Annual precipitation averages 277.9 Millimeters. 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 | 4.7 °C | 16.4 °C | 60.71 mm |
| February | 4.9 °C | 17.3 °C | 83.31 mm |
| March | 7.2 °C | 20.3 °C | 33.78 mm |
| April | 9.3 °C | 24.3 °C | 9.91 mm |
| May | 12.7 °C | 29.2 °C | 1.52 mm |
| June | 17.2 °C | 34.1 °C | 0 mm |
| July | 20.8 °C | 36.8 °C | 10.16 mm |
| August | 21.1 °C | 36.5 °C | 8.64 mm |
| September | 18.3 °C | 33.4 °C | 7.37 mm |
| October | 12.7 °C | 27.2 °C | 8.64 mm |
| November | 7.8 °C | 21 °C | 10.92 mm |
| December | 4.8 °C | 15.8 °C | 42.93 mm |
| Annual | 11.8 °C | 26 °C | 277.89 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |