Freeborn, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.6 °C (high). Annual precipitation averages 894.3 Millimeters. Freeborn is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.5 °C | -4.9 °C | 21.84 mm |
| February | -12.3 °C | -2.6 °C | 22.61 mm |
| March | -5.3 °C | 4.4 °C | 45.97 mm |
| April | 1.6 °C | 13.1 °C | 87.88 mm |
| May | 8.5 °C | 20.1 °C | 115.82 mm |
| June | 14.7 °C | 25.7 °C | 137.67 mm |
| July | 16.6 °C | 27.6 °C | 125.22 mm |
| August | 15.1 °C | 26.2 °C | 109.22 mm |
| September | 10.3 °C | 22.9 °C | 97.28 mm |
| October | 3.1 °C | 15.1 °C | 62.74 mm |
| November | -3.7 °C | 6 °C | 38.1 mm |
| December | -10.5 °C | -1.9 °C | 29.97 mm |
| Annual | 2 °C | 12.6 °C | 894.32 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |