| 2023 Hardiness Zone: | 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: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 45b - Southern Outer Piedmont | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 29379 - Union, SC | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 30 | 32 | 39 | 46 | 55 | 63 | 68 | 67 | 60 | 47 | 39 | 32 | 48 |
| Avg Max Temp (°F) | 53 | 57 | 66 | 74 | 81 | 87 | 91 | 89 | 83 | 73 | 64 | 55 | 73 |
| Avg Precip (In.) | 4.88 | 4.13 | 5.12 | 3.24 | 3.45 | 4 | 4.01 | 4.11 | 4.04 | 3.78 | 3.56 | 3.71 | 48.02 |