Frankfort, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 53.8 °F (high). Annual precipitation averages 34.4 Inches. Frankfort is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.5 °F | 29.0 °F | 2.24 in. |
| February | 18.4 °F | 30.6 °F | 1.65 in. |
| March | 24.1 °F | 39.1 °F | 1.72 in. |
| April | 33.7 °F | 51.5 °F | 3.05 in. |
| May | 43.9 °F | 63.6 °F | 3.17 in. |
| June | 53.5 °F | 72.7 °F | 3.19 in. |
| July | 59.2 °F | 76.9 °F | 3.02 in. |
| August | 58.9 °F | 75.9 °F | 3.3 in. |
| September | 51.9 °F | 70.3 °F | 3.68 in. |
| October | 41.8 °F | 57.8 °F | 4.25 in. |
| November | 32.8 °F | 44.7 °F | 2.95 in. |
| December | 24.6 °F | 34.0 °F | 2.18 in. |
| Annual | 38.4 °F | 53.8 °F | 34.4 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |