Hammond, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 52.9 °F (high). Annual precipitation averages 33.2 Inches. 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 | 3.9 °F | 21.6 °F | 0.83 in. |
| February | 7.0 °F | 26.6 °F | 0.79 in. |
| March | 19.5 °F | 39.1 °F | 1.54 in. |
| April | 32.4 °F | 53.7 °F | 2.83 in. |
| May | 45.1 °F | 66.5 °F | 4.02 in. |
| June | 55.4 °F | 75.8 °F | 5.23 in. |
| July | 59.5 °F | 80.0 °F | 4.28 in. |
| August | 57.1 °F | 77.9 °F | 4.7 in. |
| September | 49.1 °F | 70.4 °F | 3.5 in. |
| October | 36.3 °F | 56.1 °F | 2.73 in. |
| November | 24.0 °F | 40.4 °F | 1.59 in. |
| December | 11.4 °F | 26.9 °F | 1.11 in. |
| Annual | 33.4 °F | 52.9 °F | 33.15 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |