Fennimore, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 13.1 °C (high). Annual precipitation averages 966.8 Millimeters. Fennimore is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.2 °C | -3.5 °C | 32.26 mm |
| February | -10.2 °C | -0.9 °C | 32.77 mm |
| March | -3.9 °C | 5.9 °C | 51.82 mm |
| April | 2.2 °C | 13.6 °C | 99.82 mm |
| May | 8.8 °C | 19.9 °C | 115.32 mm |
| June | 14.5 °C | 25.1 °C | 145.29 mm |
| July | 16.6 °C | 27 °C | 117.86 mm |
| August | 15.5 °C | 26.1 °C | 104.14 mm |
| September | 10.8 °C | 22.3 °C | 97.54 mm |
| October | 4.4 °C | 15.2 °C | 72.9 mm |
| November | -2.1 °C | 7.1 °C | 55.63 mm |
| December | -8.2 °C | -0.2 °C | 41.4 mm |
| Annual | 3 °C | 13.1 °C | 966.75 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |