Shelbyville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 17.4 °C (high). Annual precipitation averages 1059.2 Millimeters. Shelbyville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 1.9 °C | 41.91 mm |
| February | -5.9 °C | 4.7 °C | 48.01 mm |
| March | -0.4 °C | 11.4 °C | 67.31 mm |
| April | 5.6 °C | 18 °C | 103.38 mm |
| May | 11.7 °C | 23.2 °C | 144.53 mm |
| June | 17.1 °C | 28.3 °C | 131.32 mm |
| July | 19.1 °C | 30.5 °C | 120.14 mm |
| August | 17.8 °C | 29.7 °C | 102.62 mm |
| September | 13 °C | 25.9 °C | 101.85 mm |
| October | 6.7 °C | 19.3 °C | 84.58 mm |
| November | 0.5 °C | 11.4 °C | 67.06 mm |
| December | -4.8 °C | 4.6 °C | 46.48 mm |
| Annual | 6.1 °C | 17.4 °C | 1059.19 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |