Mendon, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 17.6 °C (high). Annual precipitation averages 1037.8 Millimeters. Mendon 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 2.4 °C | 34.29 mm |
| February | -5.8 °C | 5.3 °C | 45.97 mm |
| March | -0.2 °C | 11.8 °C | 68.07 mm |
| April | 5.7 °C | 18 °C | 102.36 mm |
| May | 11.8 °C | 23.3 °C | 137.92 mm |
| June | 17.4 °C | 28.3 °C | 135.89 mm |
| July | 19.5 °C | 30.5 °C | 119.63 mm |
| August | 18.1 °C | 29.8 °C | 102.62 mm |
| September | 12.9 °C | 26.1 °C | 103.12 mm |
| October | 6.6 °C | 19.4 °C | 82.3 mm |
| November | 0.2 °C | 11.7 °C | 61.21 mm |
| December | -5.2 °C | 4.7 °C | 44.45 mm |
| Annual | 6.1 °C | 17.6 °C | 1037.83 mm |
| 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |