Sherman, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53 °F (low) to 74 °F (high). Annual precipitation averages 42.8 Inches. Sherman is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.3 °F | 53.0 °F | 2.37 in. |
| February | 35.8 °F | 57.3 °F | 2.68 in. |
| March | 43.3 °F | 65.3 °F | 3.96 in. |
| April | 51.1 °F | 73.0 °F | 3.58 in. |
| May | 60.8 °F | 80.4 °F | 5.38 in. |
| June | 69.3 °F | 88.8 °F | 4.29 in. |
| July | 73.3 °F | 93.7 °F | 2.82 in. |
| August | 72.6 °F | 94.1 °F | 2.8 in. |
| September | 65.2 °F | 86.8 °F | 3.61 in. |
| October | 53.8 °F | 76.3 °F | 4.53 in. |
| November | 43.2 °F | 64.6 °F | 3.39 in. |
| December | 34.7 °F | 55.1 °F | 3.42 in. |
| Annual | 53 °F | 74 °F | 42.83 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 |