Hamersville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.5 °C (high). Annual precipitation averages 1181.4 Millimeters. Hamersville is located in USDA Plant Hardiness Zone 6b. 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 | -5.6 °C | 3.8 °C | 82.3 mm |
| February | -4.1 °C | 6.2 °C | 78.49 mm |
| March | 0 °C | 11.3 °C | 112.01 mm |
| April | 5.7 °C | 18 °C | 117.35 mm |
| May | 11.5 °C | 22.8 °C | 125.48 mm |
| June | 16.1 °C | 27.6 °C | 118.11 mm |
| July | 17.9 °C | 29.3 °C | 121.16 mm |
| August | 17.1 °C | 28.8 °C | 92.96 mm |
| September | 13.1 °C | 25.6 °C | 82.55 mm |
| October | 6.5 °C | 19.2 °C | 76.45 mm |
| November | 1.1 °C | 11.8 °C | 82.55 mm |
| December | -2.7 °C | 6.1 °C | 91.95 mm |
| Annual | 6.4 °C | 17.5 °C | 1181.36 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 6b : -20.6°C to -17.8°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 |