Hayward, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.4 °F (low) to 52.8 °F (high). Annual precipitation averages 33.2 Inches. Hayward is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.2 °F | 21.4 °F | 0.97 in. |
| February | 3.6 °F | 27.0 °F | 0.97 in. |
| March | 15.8 °F | 39.3 °F | 1.57 in. |
| April | 29.0 °F | 53.4 °F | 2.84 in. |
| May | 41.3 °F | 66.9 °F | 3.94 in. |
| June | 51.2 °F | 75.9 °F | 4.34 in. |
| July | 55.9 °F | 80.2 °F | 4.23 in. |
| August | 53.6 °F | 77.8 °F | 4.04 in. |
| September | 46.2 °F | 70.2 °F | 3.91 in. |
| October | 34.4 °F | 55.6 °F | 3.34 in. |
| November | 22.6 °F | 39.7 °F | 1.75 in. |
| December | 9.7 °F | 26.6 °F | 1.32 in. |
| Annual | 30.4 °F | 52.8 °F | 33.22 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |