Howards Grove, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.1 °F (low) to 54.1 °F (high). Annual precipitation averages 32.9 Inches. Howards Grove is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.6 °F | 27.0 °F | 1.68 in. |
| February | 14.6 °F | 30.0 °F | 1.44 in. |
| March | 24.0 °F | 39.6 °F | 1.95 in. |
| April | 34.4 °F | 51.8 °F | 3.59 in. |
| May | 44.7 °F | 63.5 °F | 3.79 in. |
| June | 54.8 °F | 73.9 °F | 3.9 in. |
| July | 60.5 °F | 79.6 °F | 3.48 in. |
| August | 59.3 °F | 77.8 °F | 3.44 in. |
| September | 51.6 °F | 71.2 °F | 2.67 in. |
| October | 40.3 °F | 58.0 °F | 2.95 in. |
| November | 29.3 °F | 44.4 °F | 2.14 in. |
| December | 19.0 °F | 32.8 °F | 1.9 in. |
| Annual | 37.1 °F | 54.1 °F | 32.93 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |