Stephen, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29 °F (low) to 49.4 °F (high). Annual precipitation averages 22.8 Inches. Stephen is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.9 °F | 13.6 °F | 0.61 in. |
| February | -0.8 °F | 18.6 °F | 0.54 in. |
| March | 13.7 °F | 31.9 °F | 0.81 in. |
| April | 29.7 °F | 50.8 °F | 1.14 in. |
| May | 42.1 °F | 65.6 °F | 3.16 in. |
| June | 53.8 °F | 75.2 °F | 4.07 in. |
| July | 57.2 °F | 79.7 °F | 3.39 in. |
| August | 54.3 °F | 79.3 °F | 2.8 in. |
| September | 45.5 °F | 70.0 °F | 2.54 in. |
| October | 33.3 °F | 53.5 °F | 1.95 in. |
| November | 18.6 °F | 34.9 °F | 0.96 in. |
| December | 4.5 °F | 20.0 °F | 0.83 in. |
| Annual | 29 °F | 49.4 °F | 22.8 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |