Seymour, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.7 °C (low) to 12.7 °C (high). Annual precipitation averages 840.7 Millimeters. 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 | -12.6 °C | -3.8 °C | 36.32 mm |
| February | -11.6 °C | -1.7 °C | 31.24 mm |
| March | -5.8 °C | 4.6 °C | 46.23 mm |
| April | 0.8 °C | 12.1 °C | 82.8 mm |
| May | 7.4 °C | 19.3 °C | 84.58 mm |
| June | 13.1 °C | 24.6 °C | 112.78 mm |
| July | 15.4 °C | 27.1 °C | 102.87 mm |
| August | 14.4 °C | 26 °C | 93.22 mm |
| September | 9.8 °C | 22.1 °C | 94.23 mm |
| October | 3.4 °C | 14.4 °C | 81.28 mm |
| November | -2.6 °C | 6.3 °C | 45.97 mm |
| December | -8.8 °C | -0.8 °C | 40.13 mm |
| Annual | 1.9 °C | 12.5 °C | 851.65 mm |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.4 °C | -4.7 °C | 26.92 mm |
| February | -12.6 °C | -2.1 °C | 27.43 mm |
| March | -5.9 °C | 4.9 °C | 47.5 mm |
| April | 1.2 °C | 13.2 °C | 78.23 mm |
| May | 8 °C | 20.4 °C | 101.35 mm |
| June | 13.8 °C | 25.6 °C | 118.11 mm |
| July | 16 °C | 27.8 °C | 97.54 mm |
| August | 14.7 °C | 26.7 °C | 103.38 mm |
| September | 10.1 °C | 22.4 °C | 92.71 mm |
| October | 3.3 °C | 14.6 °C | 69.34 mm |
| November | -3.5 °C | 5.7 °C | 43.43 mm |
| December | -10.3 °C | -1.7 °C | 34.8 mm |
| Annual | 1.7 °C | 12.7 °C | 840.74 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |