Mount Summit, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.9 °F (low) to 60.9 °F (high). Annual precipitation averages 43.8 Inches. Mount Summit is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °F | 34.2 °F | 3.0 in. |
| February | 20.4 °F | 37.9 °F | 2.43 in. |
| March | 29.0 °F | 48.6 °F | 3.43 in. |
| April | 39.4 °F | 61.6 °F | 4.35 in. |
| May | 50.6 °F | 71.9 °F | 4.73 in. |
| June | 59.8 °F | 80.4 °F | 5.12 in. |
| July | 62.2 °F | 83.2 °F | 4.4 in. |
| August | 60.4 °F | 82.0 °F | 3.49 in. |
| September | 52.8 °F | 76.8 °F | 3.2 in. |
| October | 42.0 °F | 64.8 °F | 3.19 in. |
| November | 31.8 °F | 50.5 °F | 3.42 in. |
| December | 23.8 °F | 38.9 °F | 3.03 in. |
| Annual | 40.9 °F | 60.9 °F | 43.79 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |