Shelbyville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.2 °F (low) to 77.3 °F (high). Annual precipitation averages 55 Inches. Shelbyville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.3 °F | 58.8 °F | 5.07 in. |
| February | 39.7 °F | 63.0 °F | 4.64 in. |
| March | 46.1 °F | 70.2 °F | 5.18 in. |
| April | 53.0 °F | 77.0 °F | 4.84 in. |
| May | 62.3 °F | 83.9 °F | 4.44 in. |
| June | 69.4 °F | 90.2 °F | 4.77 in. |
| July | 71.9 °F | 93.6 °F | 3.42 in. |
| August | 71.1 °F | 94.3 °F | 3.82 in. |
| September | 65.0 °F | 89.0 °F | 3.61 in. |
| October | 53.4 °F | 79.5 °F | 4.88 in. |
| November | 44.1 °F | 68.1 °F | 4.68 in. |
| December | 37.8 °F | 60.1 °F | 5.62 in. |
| Annual | 54.2 °F | 77.3 °F | 54.97 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |