Belle Plaine, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.8 °F (low) to 55.1 °F (high). Annual precipitation averages 31.9 Inches. 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 | 5.7 °F | 23.3 °F | 0.86 in. |
| February | 9.6 °F | 27.8 °F | 0.89 in. |
| March | 22.0 °F | 40.3 °F | 1.63 in. |
| April | 35.3 °F | 55.9 °F | 2.81 in. |
| May | 47.9 °F | 69.1 °F | 4.33 in. |
| June | 58.2 °F | 78.5 °F | 4.9 in. |
| July | 62.7 °F | 82.7 °F | 3.84 in. |
| August | 59.9 °F | 80.6 °F | 4.35 in. |
| September | 51.6 °F | 73.5 °F | 3.11 in. |
| October | 38.3 °F | 59.1 °F | 2.42 in. |
| November | 25.5 °F | 42.3 °F | 1.55 in. |
| December | 12.6 °F | 28.5 °F | 1.23 in. |
| Annual | 35.8 °F | 55.1 °F | 31.92 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |