| 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 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: | 32a - Northern Blackland Prairie | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 78666 - San Marcos, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 41 | 49 | 56 | 65 | 71 | 73 | 73 | 68 | 58 | 48 | 40 | 57 |
| Avg Max Temp (°F) | 61 | 66 | 73 | 79 | 86 | 91 | 95 | 95 | 90 | 82 | 71 | 63 | 79 |
| Avg Precip (In.) | 2.05 | 2.18 | 2.13 | 2.83 | 5.21 | 4.69 | 2.08 | 2.56 | 3.37 | 3.96 | 3.15 | 2.42 | 36.62 |