Fillmore, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.3 °F (low) to 63.8 °F (high). Annual precipitation averages 37.3 Inches. 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 | 16.5 °F | 35.7 °F | 0.86 in. |
| February | 20.5 °F | 41.0 °F | 1.25 in. |
| March | 30.8 °F | 53.3 °F | 2.27 in. |
| April | 41.4 °F | 64.5 °F | 3.68 in. |
| May | 53.3 °F | 74.6 °F | 5.21 in. |
| June | 63.2 °F | 83.7 °F | 5.05 in. |
| July | 66.9 °F | 87.4 °F | 5.13 in. |
| August | 64.5 °F | 86.0 °F | 3.95 in. |
| September | 55.5 °F | 79.4 °F | 3.48 in. |
| October | 43.1 °F | 67.2 °F | 3.08 in. |
| November | 31.3 °F | 53.0 °F | 1.89 in. |
| December | 21.0 °F | 39.9 °F | 1.45 in. |
| Annual | 42.3 °F | 63.8 °F | 37.3 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |