| 2023 Hardiness Zone: | 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 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 67f - Southern Limestone/Dolomite Valleys and Low Rolling Hills |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 37870 - Speedwell, TN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 33 | 40 | 49 | 58 | 63 | 62 | 55 | 42 | 34 | 27 | 43 |
| Avg Max Temp (°F) | 44 | 49 | 58 | 68 | 75 | 83 | 86 | 85 | 80 | 69 | 58 | 48 | 67 |
| Avg Precip (In.) | 4.69 | 4.12 | 5.21 | 4.31 | 5.19 | 4.64 | 4.66 | 4.14 | 3.34 | 3.07 | 4.42 | 4.66 | 52.44 |