South Vienna, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 16 °C (high). Annual precipitation averages 1067.8 Millimeters. South Vienna 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 | -7.1 °C | 1.3 °C | 78.23 mm |
| February | -5.8 °C | 3.4 °C | 61.47 mm |
| March | -1.4 °C | 9.2 °C | 83.82 mm |
| April | 4.1 °C | 16.2 °C | 105.41 mm |
| May | 10.5 °C | 22.4 °C | 120.4 mm |
| June | 15.7 °C | 26.8 °C | 113.54 mm |
| July | 17.2 °C | 28.2 °C | 115.32 mm |
| August | 15.5 °C | 27.6 °C | 85.09 mm |
| September | 11.9 °C | 24.9 °C | 79.76 mm |
| October | 5.7 °C | 17.9 °C | 69.6 mm |
| November | 0 °C | 10.2 °C | 77.98 mm |
| December | -3.9 °C | 3.9 °C | 77.22 mm |
| Annual | 5.2 °C | 16 °C | 1067.84 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |