Belle Plaine, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 12.9 °C (high). Annual precipitation averages 810.8 Millimeters. Belle Plaine is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.6 °C | -4.8 °C | 21.84 mm |
| February | -12.4 °C | -2.3 °C | 22.61 mm |
| March | -5.6 °C | 4.6 °C | 41.4 mm |
| April | 1.8 °C | 13.3 °C | 71.37 mm |
| May | 8.8 °C | 20.6 °C | 109.98 mm |
| June | 14.6 °C | 25.8 °C | 124.46 mm |
| July | 17.1 °C | 28.2 °C | 97.54 mm |
| August | 15.5 °C | 27 °C | 110.49 mm |
| September | 10.9 °C | 23.1 °C | 78.99 mm |
| October | 3.5 °C | 15.1 °C | 61.47 mm |
| November | -3.6 °C | 5.7 °C | 39.37 mm |
| December | -10.8 °C | -1.9 °C | 31.24 mm |
| Annual | 2.1 °C | 12.9 °C | 810.76 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |