| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°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. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 67f - Southern Limestone/Dolomite Valleys and Low Rolling Hills |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 37921 - Knoxville, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 30 | 37 | 45 | 54 | 62 | 67 | 66 | 60 | 47 | 38 | 31 | 47 |
| Avg Max Temp (°F) | 46 | 51 | 60 | 70 | 77 | 84 | 87 | 86 | 81 | 71 | 59 | 49 | 69 |
| Avg Precip (In.) | 4.94 | 4.2 | 5.49 | 4.12 | 4.8 | 4.8 | 4.63 | 3.58 | 3.4 | 3.02 | 4.51 | 4.92 | 52.41 |