Shelbyville, Kentucky has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 18.8 °C (high). Annual precipitation averages 1280.9 Millimeters. Shelbyville 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 | -4.9 °C | 5.1 °C | 94.49 mm |
| February | -3.6 °C | 7.6 °C | 99.06 mm |
| March | 0.6 °C | 12.8 °C | 120.4 mm |
| April | 6.2 °C | 19.1 °C | 120.14 mm |
| May | 12.2 °C | 24 °C | 136.4 mm |
| June | 16.7 °C | 28.9 °C | 124.21 mm |
| July | 18.8 °C | 30.6 °C | 119.38 mm |
| August | 17.7 °C | 29.9 °C | 86.61 mm |
| September | 13.7 °C | 26.7 °C | 86.11 mm |
| October | 7.4 °C | 20.6 °C | 91.69 mm |
| November | 1.3 °C | 13.1 °C | 90.17 mm |
| December | -2.5 °C | 7.2 °C | 112.27 mm |
| Annual | 7 °C | 18.8 °C | 1280.93 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |