South Webster, Ohio has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 18.7 °C (high). Annual precipitation averages 1117.6 Millimeters. South Webster is located in USDA Plant Hardiness Zone 7a. 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 | -5 °C | 5 °C | 82.55 mm |
| February | -3.9 °C | 7.3 °C | 79.5 mm |
| March | -0.1 °C | 12.6 °C | 103.63 mm |
| April | 5.4 °C | 19.6 °C | 98.81 mm |
| May | 11.1 °C | 24.2 °C | 116.33 mm |
| June | 15.8 °C | 28.3 °C | 108.2 mm |
| July | 17.9 °C | 30.1 °C | 119.13 mm |
| August | 16.9 °C | 29.6 °C | 86.36 mm |
| September | 12.9 °C | 26.6 °C | 85.85 mm |
| October | 6.5 °C | 20.3 °C | 76.96 mm |
| November | 0.9 °C | 13.1 °C | 72.14 mm |
| December | -2.6 °C | 7.2 °C | 88.14 mm |
| Annual | 6.3 °C | 18.7 °C | 1117.6 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |