Waynesville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 19.4 °C (high). Annual precipitation averages 1167.4 Millimeters. Waynesville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.8 °C | 5.6 °C | 66.8 mm |
| February | -3.9 °C | 8.3 °C | 61.21 mm |
| March | 0.6 °C | 13.9 °C | 97.79 mm |
| April | 6.3 °C | 20.2 °C | 119.13 mm |
| May | 12.1 °C | 24.6 °C | 133.6 mm |
| June | 17 °C | 28.7 °C | 111.51 mm |
| July | 19.2 °C | 31.2 °C | 110.24 mm |
| August | 18.1 °C | 31 °C | 107.7 mm |
| September | 13.2 °C | 26.9 °C | 103.12 mm |
| October | 6.8 °C | 21.1 °C | 87.88 mm |
| November | 1.2 °C | 13.5 °C | 95 mm |
| December | -3.5 °C | 7.6 °C | 73.41 mm |
| Annual | 6.8 °C | 19.4 °C | 1167.39 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |