Gallipolis, Ohio has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 19 °C (high). Annual precipitation averages 1110.7 Millimeters. Gallipolis is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 5.5 °C | 82.55 mm |
| February | -3.9 °C | 7.6 °C | 76.96 mm |
| March | -0.3 °C | 12.8 °C | 101.6 mm |
| April | 5 °C | 20 °C | 92.71 mm |
| May | 10.9 °C | 24.4 °C | 115.82 mm |
| June | 15.7 °C | 28.6 °C | 109.98 mm |
| July | 18.2 °C | 30.4 °C | 116.84 mm |
| August | 17.2 °C | 29.8 °C | 90.17 mm |
| September | 13.2 °C | 26.7 °C | 88.39 mm |
| October | 6.4 °C | 20.3 °C | 76.2 mm |
| November | 0.8 °C | 13.6 °C | 70.1 mm |
| December | -2.4 °C | 7.7 °C | 89.41 mm |
| Annual | 6.3 °C | 19 °C | 1110.73 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 |