Mount Etna, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 15.9 °C (high). Annual precipitation averages 1035.3 Millimeters. Mount Etna 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 | -7.8 °C | 0.6 °C | 67.82 mm |
| February | -6.7 °C | 2.7 °C | 55.88 mm |
| March | -1.9 °C | 8.8 °C | 72.9 mm |
| April | 3.9 °C | 16.1 °C | 100.84 mm |
| May | 10.1 °C | 22.3 °C | 114.55 mm |
| June | 15.5 °C | 27.2 °C | 118.36 mm |
| July | 17.3 °C | 28.8 °C | 106.68 mm |
| August | 16.1 °C | 28.1 °C | 97.28 mm |
| September | 11.8 °C | 24.9 °C | 80.52 mm |
| October | 5.8 °C | 17.9 °C | 76.45 mm |
| November | 0.2 °C | 9.9 °C | 80.01 mm |
| December | -4.6 °C | 3.3 °C | 64.01 mm |
| Annual | 5 °C | 15.9 °C | 1035.3 mm |
| 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 : -23.3°C to -20.6°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 |