| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 20141 - Round Hill, VA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 24 | 31 | 40 | 50 | 59 | 64 | 62 | 55 | 43 | 34 | 26 | 43 |
| Avg Max Temp (°F) | 42 | 46 | 55 | 65 | 74 | 82 | 87 | 85 | 79 | 68 | 57 | 46 | 65 |
| Avg Precip (In.) | 3.22 | 2.52 | 3.68 | 3.46 | 4.44 | 4.14 | 3.78 | 3.78 | 4 | 3.41 | 3.45 | 3.11 | 42.99 |