| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| 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: | 71e - Western Pennyroyal Karst Plain |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 37073 - Greenbrier, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 27 | 36 | 44 | 54 | 63 | 66 | 64 | 57 | 45 | 37 | 28 | 46 |
| Avg Max Temp (°F) | 44 | 49 | 59 | 68 | 76 | 84 | 88 | 87 | 81 | 70 | 58 | 48 | 68 |
| Avg Precip (In.) | 4 | 4.03 | 5.17 | 4.16 | 5.38 | 4.47 | 4.12 | 3.18 | 3.74 | 3.26 | 4.47 | 4.99 | 50.95 |