Montgomery City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 18.3 °C (high). Annual precipitation averages 1076.2 Millimeters. Montgomery City is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 3.1 °C | 57.4 mm |
| February | -4.8 °C | 6.1 °C | 56.13 mm |
| March | 0.1 °C | 12 °C | 73.15 mm |
| April | 6.2 °C | 19.3 °C | 121.41 mm |
| May | 12 °C | 24.3 °C | 126.75 mm |
| June | 17.1 °C | 28.7 °C | 118.11 mm |
| July | 19.2 °C | 30.9 °C | 108.97 mm |
| August | 18.2 °C | 30.6 °C | 88.65 mm |
| September | 13.3 °C | 26.7 °C | 97.28 mm |
| October | 7.1 °C | 20.2 °C | 87.38 mm |
| November | 0.9 °C | 12.1 °C | 81.53 mm |
| December | -3.9 °C | 5.4 °C | 59.44 mm |
| Annual | 6.5 °C | 18.3 °C | 1076.2 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 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 |