Mound City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 17.6 °C (high). Annual precipitation averages 934 Millimeters. Mound City is located in USDA Plant Hardiness Zone 6a. 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 | -9 °C | 1.8 °C | 20.57 mm |
| February | -6.8 °C | 4.8 °C | 30.99 mm |
| March | -0.9 °C | 11.8 °C | 56.39 mm |
| April | 4.8 °C | 18.1 °C | 90.68 mm |
| May | 11.6 °C | 23.7 °C | 131.57 mm |
| June | 17.2 °C | 28.7 °C | 126.49 mm |
| July | 19.2 °C | 30.7 °C | 129.54 mm |
| August | 17.8 °C | 29.8 °C | 99.31 mm |
| September | 12.6 °C | 26.3 °C | 85.85 mm |
| October | 5.7 °C | 19.7 °C | 75.95 mm |
| November | -0.9 °C | 11.4 °C | 51.82 mm |
| December | -6.6 °C | 4.2 °C | 34.8 mm |
| Annual | 5.4 °C | 17.6 °C | 933.96 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |