Corunna, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.9 °F (low) to 59.7 °F (high). Annual precipitation averages 39.2 Inches. Corunna is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.1 °F | 31.8 °F | 2.52 in. |
| February | 18.9 °F | 35.6 °F | 2.13 in. |
| March | 27.2 °F | 46.9 °F | 2.49 in. |
| April | 37.7 °F | 60.6 °F | 3.67 in. |
| May | 49.1 °F | 71.5 °F | 4.54 in. |
| June | 58.8 °F | 80.6 °F | 4.06 in. |
| July | 61.8 °F | 83.8 °F | 3.85 in. |
| August | 59.9 °F | 81.8 °F | 4.03 in. |
| September | 52.4 °F | 75.9 °F | 3.26 in. |
| October | 41.6 °F | 63.2 °F | 3.06 in. |
| November | 31.6 °F | 48.6 °F | 3.06 in. |
| December | 23.0 °F | 36.6 °F | 2.49 in. |
| Annual | 39.9 °F | 59.7 °F | 39.16 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |