| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Dec. 21 - Dec. 31 |
| Average Last Frost Date: | Feb. 1 - Feb. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 34a - Northern Humid Gulf Coastal Prairies |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77377 - Tomball, 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 | 72 | 68 | 58 | 49 | 42 | 57 |
| Avg Max Temp (°F) | 61 | 65 | 73 | 79 | 85 | 91 | 94 | 94 | 89 | 82 | 71 | 63 | 79 |
| Avg Precip (In.) | 3.84 | 3.27 | 3.14 | 3.54 | 5.15 | 4.6 | 3.08 | 3.65 | 4.76 | 4.14 | 4.93 | 3.9 | 48 |