| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 65m - Rolling Coastal Plain |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 22435 - Callao, VA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 29 | 37 | 45 | 55 | 63 | 68 | 67 | 61 | 49 | 40 | 32 | 48 |
| Avg Max Temp (°F) | 46 | 49 | 58 | 68 | 76 | 84 | 88 | 86 | 81 | 70 | 60 | 50 | 68 |
| Avg Precip (In.) | 3.62 | 2.98 | 4.16 | 3.05 | 4.3 | 3.49 | 4.45 | 4.03 | 4.24 | 3.45 | 3.17 | 3.14 | 44.06 |