| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 29c - Western Cross Timbers |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 76265 - Saint Jo, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 29 | 33 | 41 | 50 | 59 | 68 | 72 | 71 | 63 | 52 | 41 | 32 | 51 |
| Avg Max Temp (°F) | 53 | 59 | 67 | 75 | 82 | 90 | 95 | 95 | 87 | 77 | 64 | 55 | 75 |
| Avg Precip (In.) | 1.69 | 2.19 | 3.01 | 3.13 | 4.99 | 3.68 | 2 | 2.27 | 3.85 | 4.42 | 2.63 | 2.26 | 36.11 |