Seneca, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 12.9 °C (high). Annual precipitation averages 959.6 Millimeters. Seneca is located in USDA Plant Hardiness Zone 5a. 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 | -12.9 °C | -3.9 °C | 32.51 mm |
| February | -11.1 °C | -1.3 °C | 30.48 mm |
| March | -4.6 °C | 5.6 °C | 51.31 mm |
| April | 1.9 °C | 13.3 °C | 101.35 mm |
| May | 8.6 °C | 19.8 °C | 117.09 mm |
| June | 14.4 °C | 24.9 °C | 146.81 mm |
| July | 16.5 °C | 27 °C | 114.3 mm |
| August | 15.4 °C | 26 °C | 105.16 mm |
| September | 10.7 °C | 22.2 °C | 96.77 mm |
| October | 4.1 °C | 15.1 °C | 71.88 mm |
| November | -2.8 °C | 6.3 °C | 52.32 mm |
| December | -9.1 °C | -0.8 °C | 39.62 mm |
| Annual | 2.6 °C | 12.9 °C | 959.6 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |