Etna, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.4 °C (high). Annual precipitation averages 1068.3 Millimeters. 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.3 °C | 78.23 mm |
| February | -5.6 °C | 3.9 °C | 61.72 mm |
| March | -1.1 °C | 9.7 °C | 88.9 mm |
| April | 4.6 °C | 16.8 °C | 100.58 mm |
| May | 10.6 °C | 22.3 °C | 107.44 mm |
| June | 15.6 °C | 26.9 °C | 114.3 mm |
| July | 17.4 °C | 28.5 °C | 114.55 mm |
| August | 16.4 °C | 27.9 °C | 90.68 mm |
| September | 12.4 °C | 25 °C | 85.09 mm |
| October | 6 °C | 18.1 °C | 73.15 mm |
| November | 0.3 °C | 11.1 °C | 75.95 mm |
| December | -3.6 °C | 4.7 °C | 77.72 mm |
| Annual | 5.5 °C | 16.4 °C | 1068.31 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |