Long Lake, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 12.4 °C (high). Annual precipitation averages 818.6 Millimeters. Long Lake 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 | -5.3 °C | 21.59 mm |
| February | -12.7 °C | -2.7 °C | 22.35 mm |
| March | -5.8 °C | 4.3 °C | 38.86 mm |
| April | 1.8 °C | 12.7 °C | 71.37 mm |
| May | 9.1 °C | 19.9 °C | 110.24 mm |
| June | 14.9 °C | 25.3 °C | 120.4 mm |
| July | 17.3 °C | 27.8 °C | 104.39 mm |
| August | 16.1 °C | 26.6 °C | 108.71 mm |
| September | 11.5 °C | 22.4 °C | 86.61 mm |
| October | 4.2 °C | 14.3 °C | 63.25 mm |
| November | -3 °C | 5.4 °C | 37.34 mm |
| December | -10.6 °C | -2.5 °C | 33.53 mm |
| Annual | 2.4 °C | 12.4 °C | 818.64 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 |