Fillmore, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 17.7 °C (high). Annual precipitation averages 947.4 Millimeters. Fillmore 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 | -8.6 °C | 2.1 °C | 21.84 mm |
| February | -6.4 °C | 5 °C | 31.75 mm |
| March | -0.7 °C | 11.8 °C | 57.66 mm |
| April | 5.2 °C | 18.1 °C | 93.47 mm |
| May | 11.8 °C | 23.7 °C | 132.33 mm |
| June | 17.3 °C | 28.7 °C | 128.27 mm |
| July | 19.4 °C | 30.8 °C | 130.3 mm |
| August | 18.1 °C | 30 °C | 100.33 mm |
| September | 13.1 °C | 26.3 °C | 88.39 mm |
| October | 6.2 °C | 19.6 °C | 78.23 mm |
| November | -0.4 °C | 11.7 °C | 48.01 mm |
| December | -6.1 °C | 4.4 °C | 36.83 mm |
| Annual | 5.7 °C | 17.7 °C | 947.41 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |