| 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 |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 1 - Mar. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 29e - Limestone Cut Plain |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 76542 - Killeen, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 39 | 46 | 54 | 62 | 68 | 71 | 70 | 65 | 55 | 45 | 38 | 54 |
| Avg Max Temp (°F) | 61 | 66 | 73 | 79 | 85 | 91 | 95 | 95 | 89 | 81 | 70 | 63 | 79 |
| Avg Precip (In.) | 1.96 | 2.54 | 2.57 | 2.87 | 4.6 | 3.75 | 1.91 | 2.24 | 3.29 | 3.7 | 2.88 | 2.62 | 34.94 |