| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 68a - Cumberland Plateau |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 37338 - Graysville, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 28 | 36 | 43 | 51 | 60 | 64 | 62 | 57 | 44 | 36 | 29 | 45 |
| Avg Max Temp (°F) | 46 | 51 | 60 | 69 | 76 | 82 | 85 | 85 | 79 | 70 | 59 | 49 | 68 |
| Avg Precip (In.) | 6.08 | 5.41 | 7.15 | 4.58 | 6 | 4.29 | 5.08 | 4.46 | 4.94 | 3.7 | 5.93 | 6.47 | 64.08 |