South Vienna, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.4 °F (low) to 60.8 °F (high). Annual precipitation averages 42 Inches. 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 | 19.3 °F | 34.4 °F | 3.08 in. |
| February | 21.5 °F | 38.1 °F | 2.42 in. |
| March | 29.5 °F | 48.5 °F | 3.3 in. |
| April | 39.4 °F | 61.1 °F | 4.15 in. |
| May | 50.9 °F | 72.3 °F | 4.74 in. |
| June | 60.3 °F | 80.2 °F | 4.47 in. |
| July | 63.0 °F | 82.8 °F | 4.54 in. |
| August | 59.9 °F | 81.7 °F | 3.35 in. |
| September | 53.5 °F | 76.8 °F | 3.14 in. |
| October | 42.3 °F | 64.2 °F | 2.74 in. |
| November | 32.0 °F | 50.3 °F | 3.07 in. |
| December | 25.0 °F | 39.0 °F | 3.04 in. |
| Annual | 41.4 °F | 60.8 °F | 42.04 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |