Mantorville, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 12.3 °C (high). Annual precipitation averages 882.9 Millimeters. Mantorville 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 | -14.6 °C | -5.2 °C | 26.42 mm |
| February | -12.6 °C | -2.7 °C | 25.4 mm |
| March | -5.7 °C | 4.2 °C | 49.53 mm |
| April | 1.1 °C | 12.7 °C | 85.6 mm |
| May | 7.9 °C | 19.7 °C | 110.24 mm |
| June | 13.8 °C | 25.1 °C | 139.7 mm |
| July | 15.8 °C | 27.1 °C | 114.81 mm |
| August | 14.3 °C | 25.9 °C | 112.52 mm |
| September | 9.8 °C | 22.2 °C | 89.41 mm |
| October | 2.7 °C | 14.6 °C | 56.13 mm |
| November | -3.9 °C | 5.5 °C | 39.88 mm |
| December | -10.5 °C | -2.1 °C | 33.27 mm |
| Annual | 1.5 °C | 12.3 °C | 882.91 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |