| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F | |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F | |
| Average First Frost Date: | Dec. 21 - Dec. 31 | |
| Average Last Frost Date: | Feb. 1 - Feb. 10 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 92503 - Riverside, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 43 | 45 | 48 | 53 | 57 | 61 | 62 | 59 | 53 | 45 | 41 | 51 |
| Avg Max Temp (°F) | 67 | 69 | 71 | 76 | 80 | 87 | 93 | 94 | 90 | 83 | 74 | 68 | 79 |
| Avg Precip (In.) | 2.52 | 2.51 | 2.2 | .62 | .23 | .06 | .03 | .13 | .26 | .32 | .86 | 1.28 | 11.01 |