Fillmore, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.2 °F (low) to 61.4 °F (high). Annual precipitation averages 45.6 Inches. Fillmore is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.4 °F | 35.1 °F | 3.19 in. |
| February | 22.1 °F | 39.6 °F | 2.64 in. |
| March | 31.1 °F | 50.3 °F | 3.35 in. |
| April | 41.2 °F | 61.9 °F | 4.65 in. |
| May | 51.9 °F | 72.0 °F | 4.96 in. |
| June | 61.0 °F | 80.5 °F | 5.29 in. |
| July | 63.9 °F | 83.2 °F | 4.64 in. |
| August | 61.7 °F | 82.1 °F | 3.13 in. |
| September | 54.6 °F | 76.9 °F | 3.62 in. |
| October | 42.9 °F | 64.6 °F | 3.5 in. |
| November | 32.7 °F | 50.9 °F | 3.63 in. |
| December | 24.2 °F | 39.3 °F | 3.01 in. |
| Annual | 42.2 °F | 61.4 °F | 45.61 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |