| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| 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 | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 37748 - Harriman, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 28 | 35 | 43 | 52 | 61 | 65 | 64 | 58 | 44 | 35 | 29 | 45 |
| Avg Max Temp (°F) | 46 | 51 | 60 | 70 | 77 | 84 | 88 | 87 | 81 | 71 | 59 | 49 | 69 |
| Avg Precip (In.) | 5.37 | 4.58 | 5.81 | 4.33 | 5.2 | 4.44 | 4.83 | 3.45 | 3.47 | 3.15 | 4.85 | 5.46 | 54.93 |