| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°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. 11 - Apr. 20 |
| 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 35803 - Huntsville, AL | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 30 | 32 | 38 | 46 | 55 | 63 | 67 | 65 | 59 | 47 | 38 | 32 | 48 |
| Avg Max Temp (°F) | 50 | 54 | 63 | 72 | 79 | 86 | 89 | 88 | 83 | 74 | 62 | 53 | 71 |
| Avg Precip (In.) | 5.5 | 4.85 | 6.48 | 4.72 | 4.89 | 4.36 | 4.51 | 3.35 | 4.33 | 3.42 | 4.94 | 5.4 | 56.75 |