Hammond, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.8 °C (low) to 11.6 °C (high). Annual precipitation averages 842 Millimeters. Hammond 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 | -15.6 °C | -5.8 °C | 21.08 mm |
| February | -13.9 °C | -3 °C | 20.07 mm |
| March | -6.9 °C | 3.9 °C | 39.12 mm |
| April | 0.2 °C | 12.1 °C | 71.88 mm |
| May | 7.3 °C | 19.2 °C | 102.11 mm |
| June | 13 °C | 24.3 °C | 132.84 mm |
| July | 15.3 °C | 26.7 °C | 108.71 mm |
| August | 13.9 °C | 25.5 °C | 119.38 mm |
| September | 9.5 °C | 21.3 °C | 88.9 mm |
| October | 2.4 °C | 13.4 °C | 69.34 mm |
| November | -4.4 °C | 4.7 °C | 40.39 mm |
| December | -11.4 °C | -2.8 °C | 28.19 mm |
| Annual | 0.8 °C | 11.6 °C | 842.01 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |