| 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 9b: 25F to 30F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95461 - Middletown, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 37 | 38 | 40 | 45 | 50 | 55 | 54 | 51 | 46 | 39 | 35 | 44 |
| Avg Max Temp (°F) | 54 | 57 | 61 | 67 | 74 | 83 | 91 | 90 | 85 | 75 | 61 | 54 | 71 |
| Avg Precip (In.) | 8.75 | 7.95 | 6.06 | 2.2 | 1.08 | .22 | .04 | .09 | .56 | 2 | 5.15 | 6.32 | 40.42 |