Fennimore, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.4 °F (low) to 55.6 °F (high). Annual precipitation averages 38.1 Inches. 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 | 10.1 °F | 25.7 °F | 1.27 in. |
| February | 13.6 °F | 30.3 °F | 1.29 in. |
| March | 24.9 °F | 42.7 °F | 2.04 in. |
| April | 36.0 °F | 56.4 °F | 3.93 in. |
| May | 47.8 °F | 67.9 °F | 4.54 in. |
| June | 58.1 °F | 77.1 °F | 5.72 in. |
| July | 61.9 °F | 80.6 °F | 4.64 in. |
| August | 59.9 °F | 78.9 °F | 4.1 in. |
| September | 51.5 °F | 72.2 °F | 3.84 in. |
| October | 39.9 °F | 59.3 °F | 2.87 in. |
| November | 28.3 °F | 44.7 °F | 2.19 in. |
| December | 17.2 °F | 31.7 °F | 1.63 in. |
| Annual | 37.4 °F | 55.6 °F | 38.06 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |