Clear Lake, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.9 °C (low) to 11.8 °C (high). Annual precipitation averages 758.4 Millimeters. Clear 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 | -15.9 °C | -6 °C | 18.29 mm |
| February | -14.2 °C | -3.3 °C | 20.07 mm |
| March | -7 °C | 3.8 °C | 38.86 mm |
| April | 0.5 °C | 12.2 °C | 68.07 mm |
| May | 7.7 °C | 19.7 °C | 102.87 mm |
| June | 13.7 °C | 24.9 °C | 107.95 mm |
| July | 15.9 °C | 27.3 °C | 94.74 mm |
| August | 14.3 °C | 26.1 °C | 100.33 mm |
| September | 9.7 °C | 21.9 °C | 77.47 mm |
| October | 2.6 °C | 13.8 °C | 68.07 mm |
| November | -4.5 °C | 4.7 °C | 36.32 mm |
| December | -11.6 °C | -3.1 °C | 25.4 mm |
| Annual | 0.9 °C | 11.8 °C | 758.44 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |