Perris, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9.8 °C (low) to 26.5 °C (high). Annual precipitation averages 259.6 Millimeters. Perris is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.5 °C | 19.2 °C | 62.74 mm |
| February | 4.8 °C | 19.4 °C | 74.93 mm |
| March | 6.5 °C | 21.4 °C | 29.97 mm |
| April | 8 °C | 24.1 °C | 17.78 mm |
| May | 11 °C | 27.2 °C | 5.84 mm |
| June | 13.2 °C | 31.4 °C | 1.27 mm |
| July | 16.3 °C | 35.2 °C | 1.27 mm |
| August | 16.7 °C | 35.9 °C | 1.78 mm |
| September | 14.8 °C | 33.6 °C | 3.3 mm |
| October | 10.9 °C | 28.2 °C | 8.64 mm |
| November | 6.7 °C | 23.3 °C | 17.02 mm |
| December | 3.8 °C | 18.9 °C | 35.05 mm |
| Annual | 9.8 °C | 26.5 °C | 259.59 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |