| 2023 Hardiness Zone: | 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: | 32a - Northern Blackland Prairie | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 78664 - Round Rock, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 37 | 41 | 48 | 55 | 64 | 70 | 72 | 71 | 66 | 57 | 47 | 40 | 56 |
| Avg Max Temp (°F) | 61 | 66 | 73 | 80 | 86 | 92 | 96 | 96 | 90 | 82 | 70 | 63 | 79 |
| Avg Precip (In.) | 2.07 | 2.35 | 2.39 | 2.78 | 4.86 | 3.82 | 1.83 | 2.12 | 3.19 | 3.88 | 2.88 | 2.56 | 34.73 |