Mantorville, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 54 °F (high). Annual precipitation averages 34.8 Inches. 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 | 5.7 °F | 22.6 °F | 1.04 in. |
| February | 9.3 °F | 27.2 °F | 1.0 in. |
| March | 21.7 °F | 39.5 °F | 1.95 in. |
| April | 33.9 °F | 54.9 °F | 3.37 in. |
| May | 46.3 °F | 67.4 °F | 4.34 in. |
| June | 56.9 °F | 77.2 °F | 5.5 in. |
| July | 60.4 °F | 80.8 °F | 4.52 in. |
| August | 57.8 °F | 78.6 °F | 4.43 in. |
| September | 49.6 °F | 71.9 °F | 3.52 in. |
| October | 36.9 °F | 58.2 °F | 2.21 in. |
| November | 25.0 °F | 41.9 °F | 1.57 in. |
| December | 13.1 °F | 28.3 °F | 1.31 in. |
| Annual | 34.7 °F | 54 °F | 34.76 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |