| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F | |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F | |
| Average First Frost Date: | Nov. 21 - Nov. 30 | |
| Average Last Frost Date: | Feb. 21 - Feb. 29 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 35e - Southern Tertiary Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77320 - Huntsville, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 42 | 49 | 56 | 64 | 70 | 72 | 72 | 67 | 57 | 48 | 41 | 56 |
| Avg Max Temp (°F) | 59 | 64 | 71 | 78 | 85 | 90 | 94 | 94 | 89 | 80 | 69 | 61 | 78 |
| Avg Precip (In.) | 4.16 | 3.1 | 3.44 | 3.5 | 5.15 | 4.54 | 2.61 | 3.49 | 4.59 | 4.32 | 4.63 | 4.04 | 47.56 |