Hawthorne, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.1 °C (low) to 10.6 °C (high). Annual precipitation averages 830.6 Millimeters. Hawthorne is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.3 °C | -6.7 °C | 27.18 mm |
| February | -15.6 °C | -3.6 °C | 25.15 mm |
| March | -8.9 °C | 2.9 °C | 41.15 mm |
| April | -2 °C | 10.3 °C | 70.36 mm |
| May | 4.4 °C | 18.2 °C | 89.92 mm |
| June | 9.8 °C | 23.3 °C | 109.47 mm |
| July | 13.1 °C | 25.8 °C | 111.76 mm |
| August | 12.2 °C | 24.8 °C | 97.79 mm |
| September | 7.8 °C | 20.2 °C | 89.66 mm |
| October | 1.3 °C | 12.2 °C | 80.77 mm |
| November | -5.6 °C | 3.4 °C | 49.78 mm |
| December | -12.7 °C | -3.8 °C | 37.59 mm |
| Annual | -1.1 °C | 10.6 °C | 830.58 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |