Seneca, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.7 °F (low) to 55.1 °F (high). Annual precipitation averages 37.8 Inches. 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 | 8.8 °F | 25.0 °F | 1.28 in. |
| February | 12.1 °F | 29.6 °F | 1.2 in. |
| March | 23.8 °F | 42.1 °F | 2.02 in. |
| April | 35.5 °F | 55.9 °F | 3.99 in. |
| May | 47.4 °F | 67.7 °F | 4.61 in. |
| June | 57.9 °F | 76.8 °F | 5.78 in. |
| July | 61.7 °F | 80.6 °F | 4.5 in. |
| August | 59.7 °F | 78.8 °F | 4.14 in. |
| September | 51.2 °F | 71.9 °F | 3.81 in. |
| October | 39.3 °F | 59.1 °F | 2.83 in. |
| November | 26.9 °F | 43.4 °F | 2.06 in. |
| December | 15.6 °F | 30.6 °F | 1.56 in. |
| Annual | 36.7 °F | 55.1 °F | 37.78 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 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |