| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 71g - Eastern Highland Rim |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 35824 - Huntsville, AL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 31 | 33 | 41 | 48 | 57 | 65 | 68 | 67 | 61 | 49 | 40 | 34 | 49 |
| Avg Max Temp (°F) | 50 | 55 | 64 | 72 | 80 | 87 | 89 | 89 | 83 | 74 | 62 | 53 | 71 |
| Avg Precip (In.) | 5.52 | 4.87 | 6.6 | 4.6 | 5.12 | 4.32 | 4.45 | 3.32 | 4.25 | 3.49 | 5.15 | 5.57 | 57.26 |