| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Dec. 1 - Dec. 10 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95658 - Newcastle, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 39 | 41 | 44 | 50 | 55 | 60 | 59 | 56 | 50 | 41 | 36 | 47 |
| Avg Max Temp (°F) | 54 | 58 | 62 | 68 | 77 | 86 | 92 | 91 | 86 | 76 | 61 | 55 | 72 |
| Avg Precip (In.) | 6.03 | 5.74 | 5.62 | 2.3 | 1.08 | .33 | .11 | .1 | .7 | 1.79 | 4.5 | 4.77 | 33.05 |