Hawley, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 10.9 °C (high). Annual precipitation averages 637.3 Millimeters. Hawley 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 | -18.1 °C | -8.2 °C | 16.51 mm |
| February | -16.4 °C | -5.6 °C | 16 mm |
| March | -8.3 °C | 1.8 °C | 23.88 mm |
| April | -0.3 °C | 11.4 °C | 37.08 mm |
| May | 6.8 °C | 19.7 °C | 78.74 mm |
| June | 12.9 °C | 24.9 °C | 107.7 mm |
| July | 15.3 °C | 27.1 °C | 92.46 mm |
| August | 13.9 °C | 26.4 °C | 78.23 mm |
| September | 9.1 °C | 21.6 °C | 79.76 mm |
| October | 1.7 °C | 12.8 °C | 66.29 mm |
| November | -6.1 °C | 3.1 °C | 20.83 mm |
| December | -13.6 °C | -4.5 °C | 19.81 mm |
| Annual | -0.3 °C | 10.9 °C | 637.29 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |