| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 63e - Mid-Atlantic Flatwoods |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 23430 - Smithfield, VA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 30 | 31 | 38 | 46 | 56 | 64 | 69 | 68 | 62 | 50 | 41 | 34 | 49 |
| Avg Max Temp (°F) | 48 | 51 | 59 | 69 | 77 | 84 | 88 | 87 | 81 | 71 | 61 | 53 | 69 |
| Avg Precip (In.) | 4.18 | 3.49 | 4.53 | 3.31 | 4.05 | 3.7 | 4.98 | 4.86 | 4.7 | 3.6 | 3.19 | 3.33 | 47.91 |