Shelbyville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 62.9 °F (high). Annual precipitation averages 44.3 Inches. 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 | 20.5 °F | 36.2 °F | 3.07 in. |
| February | 23.2 °F | 40.5 °F | 2.56 in. |
| March | 31.6 °F | 51.1 °F | 3.41 in. |
| April | 42.4 °F | 63.8 °F | 4.63 in. |
| May | 53.3 °F | 73.7 °F | 4.9 in. |
| June | 62.3 °F | 82.1 °F | 5.08 in. |
| July | 65.1 °F | 84.8 °F | 4.24 in. |
| August | 63.2 °F | 84.0 °F | 3.2 in. |
| September | 55.6 °F | 78.7 °F | 3.25 in. |
| October | 44.0 °F | 66.5 °F | 3.13 in. |
| November | 33.7 °F | 52.4 °F | 3.45 in. |
| December | 25.8 °F | 40.7 °F | 3.34 in. |
| Annual | 43.4 °F | 62.9 °F | 44.26 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |