Harrisburg, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17 °C (high). Annual precipitation averages 1044.9 Millimeters. Harrisburg 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 | -7.5 °C | 0.7 °C | 76.71 mm |
| February | -7 °C | 2.3 °C | 56.64 mm |
| March | -2.2 °C | 7.7 °C | 82.04 mm |
| April | 3.6 °C | 15.1 °C | 92.2 mm |
| May | 9.3 °C | 20.7 °C | 103.63 mm |
| June | 14.7 °C | 25.7 °C | 111.51 mm |
| July | 16.7 °C | 27.8 °C | 112.27 mm |
| August | 15.6 °C | 26.7 °C | 91.44 mm |
| September | 11.8 °C | 23.3 °C | 86.61 mm |
| October | 5.6 °C | 16.8 °C | 80.52 mm |
| November | 0.3 °C | 9.5 °C | 74.68 mm |
| December | -4.4 °C | 3.4 °C | 73.15 mm |
| Annual | 4.7 °C | 15 °C | 1041.4 mm |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 2.5 °C | 78.74 mm |
| February | -4.9 °C | 4.4 °C | 60.2 mm |
| March | -0.4 °C | 10.2 °C | 85.34 mm |
| April | 5.3 °C | 17.6 °C | 95.25 mm |
| May | 11.6 °C | 23.2 °C | 116.33 mm |
| June | 16.4 °C | 27.8 °C | 114.3 mm |
| July | 18.2 °C | 29.3 °C | 104.9 mm |
| August | 17.1 °C | 28.7 °C | 92.96 mm |
| September | 13.1 °C | 25.6 °C | 77.72 mm |
| October | 6.7 °C | 18.7 °C | 67.31 mm |
| November | 1 °C | 11.2 °C | 78.74 mm |
| December | -2.8 °C | 5.1 °C | 73.15 mm |
| Annual | 6.3 °C | 17 °C | 1044.94 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |