Frankfort, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 61.8 °F (high). Annual precipitation averages 42.6 Inches. Frankfort 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 | 18.9 °F | 34.2 °F | 2.89 in. |
| February | 21.3 °F | 38.2 °F | 2.37 in. |
| March | 30.4 °F | 49.6 °F | 3.01 in. |
| April | 40.9 °F | 62.7 °F | 3.96 in. |
| May | 52.1 °F | 73.2 °F | 4.45 in. |
| June | 60.8 °F | 81.2 °F | 5.18 in. |
| July | 64.0 °F | 84.2 °F | 4.82 in. |
| August | 61.8 °F | 83.1 °F | 3.51 in. |
| September | 54.5 °F | 78.4 °F | 3.11 in. |
| October | 43.3 °F | 66.0 °F | 3.14 in. |
| November | 33.2 °F | 51.1 °F | 3.31 in. |
| December | 24.4 °F | 39.2 °F | 2.81 in. |
| Annual | 42.1 °F | 61.8 °F | 42.56 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 |