Santo, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.4 °F (low) to 77.7 °F (high). Annual precipitation averages 32.9 Inches. Santo is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.7 °F | 58.2 °F | 1.73 in. |
| February | 36.1 °F | 61.6 °F | 2.24 in. |
| March | 44.3 °F | 69.3 °F | 2.85 in. |
| April | 52.2 °F | 77.7 °F | 2.75 in. |
| May | 61.8 °F | 84.5 °F | 4.24 in. |
| June | 70.3 °F | 92.1 °F | 3.61 in. |
| July | 73.7 °F | 96.4 °F | 2.03 in. |
| August | 72.8 °F | 96.6 °F | 2.49 in. |
| September | 65.2 °F | 89.5 °F | 3.15 in. |
| October | 53.9 °F | 79.3 °F | 3.63 in. |
| November | 43.1 °F | 67.6 °F | 2.31 in. |
| December | 34.3 °F | 59.1 °F | 1.89 in. |
| Annual | 53.4 °F | 77.7 °F | 32.92 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |