Long Prairie, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.9 °F (low) to 52 °F (high). Annual precipitation averages 29 Inches. Long Prairie 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °F | 19.5 °F | 0.78 in. |
| February | 4.7 °F | 24.8 °F | 0.75 in. |
| March | 17.5 °F | 37.2 °F | 1.38 in. |
| April | 31.0 °F | 52.8 °F | 2.46 in. |
| May | 44.2 °F | 66.3 °F | 3.41 in. |
| June | 55.0 °F | 75.9 °F | 4.52 in. |
| July | 59.2 °F | 80.4 °F | 4.29 in. |
| August | 56.3 °F | 78.5 °F | 3.43 in. |
| September | 48.0 °F | 70.3 °F | 3.0 in. |
| October | 35.1 °F | 55.1 °F | 2.81 in. |
| November | 22.0 °F | 38.5 °F | 1.22 in. |
| December | 9.0 °F | 24.9 °F | 0.96 in. |
| Annual | 31.9 °F | 52 °F | 29.01 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 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |