Moreno Valley, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 10.4 °C (low) to 25.8 °C (high). Annual precipitation averages 273.8 Millimeters. Moreno Valley is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.6 °C | 18.8 °C | 57.4 mm |
| February | 5.5 °C | 18.9 °C | 69.85 mm |
| March | 6.8 °C | 20.8 °C | 42.93 mm |
| April | 8.3 °C | 23.3 °C | 17.27 mm |
| May | 11.1 °C | 26.2 °C | 6.35 mm |
| June | 13.4 °C | 30.4 °C | 1.78 mm |
| July | 16.6 °C | 34.4 °C | 2.03 mm |
| August | 17.1 °C | 35.1 °C | 2.03 mm |
| September | 15.4 °C | 32.9 °C | 3.3 mm |
| October | 11.8 °C | 27.7 °C | 11.68 mm |
| November | 7.9 °C | 22.8 °C | 16.76 mm |
| December | 5.2 °C | 18.4 °C | 42.42 mm |
| Annual | 10.4 °C | 25.8 °C | 273.8 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 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 | BSk - Cold Semi-Arid Climate |