| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Feb. 11 - Feb. 20 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 95004 - Aromas, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 41 | 42 | 44 | 48 | 51 | 53 | 53 | 52 | 48 | 42 | 37 | 46 |
| Avg Max Temp (°F) | 60 | 63 | 65 | 69 | 71 | 75 | 77 | 78 | 78 | 76 | 66 | 60 | 70 |
| Avg Precip (In.) | 4.58 | 4.46 | 3.71 | 1.22 | .43 | .12 | .07 | .07 | .32 | .99 | 2.65 | 3.09 | 21.7 |