Waynesburg, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.2 °C (low) to 16 °C (high). Annual precipitation averages 1059.9 Millimeters. Waynesburg is located in USDA Plant Hardiness Zone 6b. 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 | -6.7 °C | 1.7 °C | 77.98 mm |
| February | -6 °C | 3.4 °C | 58.67 mm |
| March | -1.7 °C | 8.8 °C | 82.3 mm |
| April | 4 °C | 16.4 °C | 93.47 mm |
| May | 9.9 °C | 22 °C | 103.63 mm |
| June | 14.8 °C | 26.6 °C | 121.92 mm |
| July | 17 °C | 28.6 °C | 110.24 mm |
| August | 16 °C | 27.9 °C | 95.25 mm |
| September | 12.2 °C | 24.4 °C | 87.12 mm |
| October | 6 °C | 17.8 °C | 80.77 mm |
| November | 0.7 °C | 10.4 °C | 73.41 mm |
| December | -3.5 °C | 4.4 °C | 75.18 mm |
| Annual | 5.2 °C | 16 °C | 1059.94 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 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 | Dfb - Humid Continental Mild Summer, Wet All Year |