Waynesburg, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 62.5 °F (high). Annual precipitation averages 43.1 Inches. Waynesburg is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.1 °F | 38.1 °F | 3.36 in. |
| February | 21.4 °F | 41.1 °F | 2.85 in. |
| March | 28.4 °F | 50.6 °F | 3.58 in. |
| April | 37.8 °F | 63.8 °F | 3.41 in. |
| May | 48.1 °F | 72.8 °F | 4.44 in. |
| June | 57.0 °F | 80.0 °F | 4.42 in. |
| July | 61.1 °F | 83.8 °F | 4.24 in. |
| August | 59.4 °F | 82.7 °F | 3.75 in. |
| September | 52.5 °F | 76.8 °F | 3.63 in. |
| October | 40.9 °F | 65.1 °F | 3.21 in. |
| November | 31.8 °F | 52.6 °F | 2.9 in. |
| December | 25.1 °F | 42.3 °F | 3.3 in. |
| Annual | 40.3 °F | 62.5 °F | 43.09 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |