Pierz, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 11.5 °C (high). Annual precipitation averages 744.5 Millimeters. Pierz 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 | -17.3 °C | -6.6 °C | 17.78 mm |
| February | -15.4 °C | -3.6 °C | 19.81 mm |
| March | -8.1 °C | 3.6 °C | 35.81 mm |
| April | -0.6 °C | 11.8 °C | 62.74 mm |
| May | 6.7 °C | 19.4 °C | 90.42 mm |
| June | 12.6 °C | 24.6 °C | 114.05 mm |
| July | 15.1 °C | 27.4 °C | 105.16 mm |
| August | 13.5 °C | 26.1 °C | 96.01 mm |
| September | 8.9 °C | 21.6 °C | 73.91 mm |
| October | 1.9 °C | 13.3 °C | 71.12 mm |
| November | -5.3 °C | 3.9 °C | 33.27 mm |
| December | -12.6 °C | -3.6 °C | 24.38 mm |
| Annual | -0.1 °C | 11.5 °C | 744.46 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |