| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 95966 - Oroville, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 40 | 43 | 45 | 51 | 57 | 61 | 59 | 55 | 48 | 41 | 36 | 48 |
| Avg Max Temp (°F) | 54 | 60 | 64 | 70 | 79 | 88 | 94 | 93 | 87 | 77 | 62 | 55 | 74 |
| Avg Precip (In.) | 6.1 | 5.49 | 4.99 | 2.15 | 1.16 | .35 | .07 | .16 | .55 | 1.7 | 4.12 | 4.6 | 31.44 |