| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F | |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F | |
| Average First Frost Date: | December 1 - 10 | |
| Average Last Frost Date: | February 21 - 28 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 32b - Southern Blackland/Fayette Prairie | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77833 - Brenham, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 43 | 50 | 57 | 65 | 71 | 73 | 73 | 68 | 58 | 49 | 42 | 57 |
| Avg Max Temp (°F) | 62 | 67 | 74 | 80 | 87 | 93 | 97 | 97 | 91 | 83 | 72 | 64 | 80 |
| Avg Precip (In.) | 3.39 | 2.79 | 2.96 | 3.34 | 5.13 | 4.6 | 1.94 | 3 | 4.66 | 4.4 | 4.15 | 3.33 | 43.68 |