Millersville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.9 °C (low) to 19.9 °C (high). Annual precipitation averages 1243.1 Millimeters. Millersville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 5.7 °C | 83.82 mm |
| February | -2.3 °C | 8.8 °C | 84.84 mm |
| March | 2 °C | 14.2 °C | 115.57 mm |
| April | 7.5 °C | 20.5 °C | 136.4 mm |
| May | 13.3 °C | 25.3 °C | 139.7 mm |
| June | 18.1 °C | 30.2 °C | 102.87 mm |
| July | 20.1 °C | 31.8 °C | 105.66 mm |
| August | 18.8 °C | 31.3 °C | 83.06 mm |
| September | 14.2 °C | 27.8 °C | 86.87 mm |
| October | 7.6 °C | 21.6 °C | 93.47 mm |
| November | 2.2 °C | 13.9 °C | 115.57 mm |
| December | -2.2 °C | 7.5 °C | 95.25 mm |
| Annual | 7.9 °C | 19.9 °C | 1243.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |