Hatfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.7 °F (low) to 55.6 °F (high). Annual precipitation averages 35.7 Inches. Hatfield is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.0 °F | 24.9 °F | 1.19 in. |
| February | 8.0 °F | 30.0 °F | 1.14 in. |
| March | 19.6 °F | 42.1 °F | 1.8 in. |
| April | 31.6 °F | 56.6 °F | 3.43 in. |
| May | 43.4 °F | 69.0 °F | 4.46 in. |
| June | 53.4 °F | 78.1 °F | 5.1 in. |
| July | 57.4 °F | 81.9 °F | 4.1 in. |
| August | 55.4 °F | 79.9 °F | 4.3 in. |
| September | 47.0 °F | 72.7 °F | 3.7 in. |
| October | 35.3 °F | 59.3 °F | 2.96 in. |
| November | 23.9 °F | 43.0 °F | 1.93 in. |
| December | 12.3 °F | 30.0 °F | 1.54 in. |
| Annual | 32.7 °F | 55.6 °F | 35.65 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |