Stacy, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1 °C (low) to 12.8 °C (high). Annual precipitation averages 812.3 Millimeters. Stacy 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.4 °C | -4.9 °C | 20.32 mm |
| February | -13.6 °C | -1.9 °C | 20.57 mm |
| March | -6.8 °C | 5.1 °C | 37.59 mm |
| April | 0.4 °C | 13.4 °C | 73.41 mm |
| May | 7.6 °C | 20.5 °C | 106.17 mm |
| June | 13.1 °C | 25.6 °C | 113.54 mm |
| July | 15.7 °C | 28.1 °C | 112.27 mm |
| August | 14.3 °C | 26.9 °C | 103.63 mm |
| September | 9.8 °C | 22.7 °C | 82.3 mm |
| October | 2.8 °C | 14.8 °C | 71.12 mm |
| November | -4.1 °C | 5.5 °C | 41.91 mm |
| December | -11.3 °C | -2.1 °C | 29.46 mm |
| Annual | 1 °C | 12.8 °C | 812.29 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |