| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 45e - Northern Inner Piedmont |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 22567 - Unionville, VA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 34 | 42 | 52 | 60 | 65 | 63 | 57 | 44 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 44 | 48 | 57 | 68 | 76 | 83 | 87 | 85 | 79 | 68 | 58 | 48 | 67 |
| Avg Precip (In.) | 3.39 | 2.9 | 3.81 | 3.2 | 4.24 | 3.93 | 4.49 | 3.88 | 3.97 | 3.87 | 3.64 | 3.15 | 44.49 |