Freeport, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.7 °F (low) to 52.9 °F (high). Annual precipitation averages 28.7 Inches. Freeport is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °F | 20.2 °F | 0.7 in. |
| February | 5.6 °F | 25.4 °F | 0.72 in. |
| March | 18.4 °F | 37.9 °F | 1.38 in. |
| April | 31.8 °F | 53.7 °F | 2.47 in. |
| May | 44.9 °F | 67.2 °F | 3.53 in. |
| June | 55.6 °F | 77.1 °F | 4.42 in. |
| July | 60.1 °F | 81.6 °F | 4.2 in. |
| August | 57.2 °F | 79.4 °F | 3.66 in. |
| September | 48.8 °F | 71.3 °F | 2.67 in. |
| October | 35.9 °F | 56.1 °F | 2.75 in. |
| November | 22.6 °F | 39.0 °F | 1.23 in. |
| December | 9.5 °F | 25.8 °F | 0.92 in. |
| Annual | 32.7 °F | 52.9 °F | 28.65 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |