Ulen, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.4 °C (low) to 10.5 °C (high). Annual precipitation averages 634.8 Millimeters. Ulen is located in USDA Plant Hardiness Zone 4a. 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 | -18.1 °C | -8.6 °C | 18.29 mm |
| February | -16.4 °C | -5.9 °C | 16.51 mm |
| March | -8.4 °C | 1.4 °C | 24.89 mm |
| April | -0.4 °C | 11 °C | 38.1 mm |
| May | 6.6 °C | 19.2 °C | 80.01 mm |
| June | 12.8 °C | 24.4 °C | 111.25 mm |
| July | 15.1 °C | 26.8 °C | 90.17 mm |
| August | 13.6 °C | 26.1 °C | 74.17 mm |
| September | 8.8 °C | 21.3 °C | 75.44 mm |
| October | 1.7 °C | 12.6 °C | 62.23 mm |
| November | -6.1 °C | 2.9 °C | 22.61 mm |
| December | -13.6 °C | -4.8 °C | 21.08 mm |
| Annual | -0.4 °C | 10.5 °C | 634.75 mm |
| 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |