Thomasville, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.7 °C (low) to 20.6 °C (high). Annual precipitation averages 1222.2 Millimeters. Thomasville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 7.4 °C | 75.44 mm |
| February | -3.5 °C | 10.2 °C | 80.01 mm |
| March | 1 °C | 15.6 °C | 114.05 mm |
| April | 6.4 °C | 21.6 °C | 137.41 mm |
| May | 11.8 °C | 25.4 °C | 138.94 mm |
| June | 16.6 °C | 29.8 °C | 94.49 mm |
| July | 18.8 °C | 32.1 °C | 101.85 mm |
| August | 18 °C | 31.8 °C | 91.44 mm |
| September | 13.1 °C | 27.8 °C | 98.04 mm |
| October | 6.2 °C | 21.8 °C | 92.96 mm |
| November | 0.8 °C | 14.8 °C | 112.01 mm |
| December | -3.4 °C | 8.8 °C | 85.6 mm |
| Annual | 6.7 °C | 20.6 °C | 1222.24 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |