Monroe City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 17.7 °C (high). Annual precipitation averages 1034.8 Millimeters. Monroe 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.3 °C | 2.3 °C | 51.31 mm |
| February | -5.6 °C | 5 °C | 53.09 mm |
| March | -0.1 °C | 11.6 °C | 72.14 mm |
| April | 5.9 °C | 18.4 °C | 108.46 mm |
| May | 12 °C | 23.7 °C | 125.22 mm |
| June | 17.3 °C | 28.7 °C | 122.94 mm |
| July | 19.3 °C | 30.8 °C | 105.92 mm |
| August | 18.2 °C | 29.9 °C | 97.28 mm |
| September | 13.4 °C | 26.3 °C | 90.93 mm |
| October | 6.9 °C | 19.5 °C | 82.8 mm |
| November | 0.7 °C | 11.6 °C | 71.12 mm |
| December | -4.4 °C | 4.7 °C | 53.59 mm |
| Annual | 6.4 °C | 17.7 °C | 1034.8 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |