Seymour, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35 °F (low) to 54.9 °F (high). Annual precipitation averages 33.1 Inches. Seymour 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.4 °F | 25.2 °F | 1.43 in. |
| February | 11.2 °F | 28.9 °F | 1.23 in. |
| March | 21.6 °F | 40.2 °F | 1.82 in. |
| April | 33.4 °F | 53.8 °F | 3.26 in. |
| May | 45.3 °F | 66.7 °F | 3.33 in. |
| June | 55.5 °F | 76.2 °F | 4.44 in. |
| July | 59.7 °F | 80.7 °F | 4.05 in. |
| August | 57.9 °F | 78.8 °F | 3.67 in. |
| September | 49.7 °F | 71.7 °F | 3.71 in. |
| October | 38.2 °F | 57.9 °F | 3.2 in. |
| November | 27.4 °F | 43.4 °F | 1.81 in. |
| December | 16.2 °F | 30.6 °F | 1.58 in. |
| Annual | 35.5 °F | 54.5 °F | 33.53 in. |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.0 °F | 23.5 °F | 1.06 in. |
| February | 9.4 °F | 28.3 °F | 1.08 in. |
| March | 21.4 °F | 40.9 °F | 1.87 in. |
| April | 34.1 °F | 55.7 °F | 3.08 in. |
| May | 46.4 °F | 68.7 °F | 3.99 in. |
| June | 56.8 °F | 78.0 °F | 4.65 in. |
| July | 60.8 °F | 82.1 °F | 3.84 in. |
| August | 58.5 °F | 80.1 °F | 4.07 in. |
| September | 50.1 °F | 72.4 °F | 3.65 in. |
| October | 37.9 °F | 58.3 °F | 2.73 in. |
| November | 25.7 °F | 42.2 °F | 1.71 in. |
| December | 13.4 °F | 28.9 °F | 1.37 in. |
| Annual | 35 °F | 54.9 °F | 33.1 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |