Harveysburg, 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 17.1 °C (high). Annual precipitation averages 1086.9 Millimeters. Harveysburg 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 2.8 °C | 80.77 mm |
| February | -4.7 °C | 4.8 °C | 65.79 mm |
| March | -0.2 °C | 10.4 °C | 93.47 mm |
| April | 5.6 °C | 17.5 °C | 112.78 mm |
| May | 11.6 °C | 23 °C | 117.6 mm |
| June | 16.5 °C | 27.6 °C | 117.6 mm |
| July | 18.2 °C | 29.2 °C | 105.92 mm |
| August | 17.1 °C | 28.7 °C | 80.26 mm |
| September | 13.1 °C | 25.6 °C | 75.44 mm |
| October | 6.8 °C | 18.9 °C | 76.96 mm |
| November | 1.2 °C | 11.4 °C | 77.22 mm |
| December | -3.1 °C | 5.2 °C | 83.06 mm |
| Annual | 6.4 °C | 17.1 °C | 1086.87 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 |