| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 66f - Limestone Valleys and Coves |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 37650 - Erwin, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 34 | 40 | 49 | 57 | 61 | 60 | 54 | 41 | 34 | 27 | 42 |
| Avg Max Temp (°F) | 47 | 51 | 60 | 68 | 75 | 82 | 85 | 84 | 79 | 69 | 59 | 50 | 67 |
| Avg Precip (In.) | 3.38 | 3.35 | 4.22 | 3.8 | 5.47 | 4.73 | 5.72 | 3.79 | 3.47 | 2.26 | 2.89 | 3.12 | 46.18 |