Big Lake, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.4 °C (low) to 12.2 °C (high). Annual precipitation averages 789.4 Millimeters. Big Lake 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.3 °C | -5.6 °C | 19.56 mm |
| February | -13.5 °C | -2.8 °C | 21.08 mm |
| March | -6.4 °C | 4.2 °C | 41.4 mm |
| April | 0.9 °C | 12.7 °C | 70.1 mm |
| May | 8.1 °C | 20 °C | 105.92 mm |
| June | 13.9 °C | 25.3 °C | 112.01 mm |
| July | 16.3 °C | 27.8 °C | 101.35 mm |
| August | 14.8 °C | 26.4 °C | 103.38 mm |
| September | 10.2 °C | 22.2 °C | 80.52 mm |
| October | 3.1 °C | 13.9 °C | 68.58 mm |
| November | -4.1 °C | 5.1 °C | 37.34 mm |
| December | -11.2 °C | -2.7 °C | 28.19 mm |
| Annual | 1.4 °C | 12.2 °C | 789.43 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |