Freeport, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.5 °C (low) to 14 °C (high). Annual precipitation averages 968.3 Millimeters. Freeport is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.4 °C | -0.9 °C | 67.06 mm |
| February | -8.3 °C | 0.5 °C | 54.1 mm |
| March | -4.2 °C | 6.3 °C | 59.69 mm |
| April | 1.8 °C | 13.7 °C | 94.49 mm |
| May | 8.1 °C | 20.3 °C | 105.92 mm |
| June | 13.5 °C | 25.6 °C | 98.04 mm |
| July | 15.6 °C | 27.7 °C | 86.87 mm |
| August | 14.8 °C | 26.7 °C | 90.68 mm |
| September | 10.3 °C | 22.9 °C | 81.28 mm |
| October | 4.5 °C | 15.8 °C | 93.22 mm |
| November | -0.7 °C | 8.1 °C | 74.42 mm |
| December | -5.1 °C | 1.8 °C | 62.48 mm |
| Annual | 3.5 °C | 14 °C | 968.25 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |