Fountain City, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.3 °C (low) to 13.3 °C (high). Annual precipitation averages 897.9 Millimeters. Fountain City 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.8 °C | -3.8 °C | 28.19 mm |
| February | -11.9 °C | -1.1 °C | 28.45 mm |
| March | -5.2 °C | 6 °C | 49.28 mm |
| April | 1.8 °C | 14.1 °C | 94.74 mm |
| May | 8.4 °C | 20.6 °C | 111.51 mm |
| June | 14.2 °C | 25.9 °C | 127.51 mm |
| July | 16.5 °C | 27.9 °C | 104.9 mm |
| August | 15.3 °C | 26.9 °C | 116.59 mm |
| September | 10.8 °C | 22.7 °C | 94.49 mm |
| October | 3.9 °C | 15.2 °C | 64.52 mm |
| November | -2.8 °C | 6.4 °C | 45.47 mm |
| December | -9.6 °C | -0.9 °C | 32.26 mm |
| Annual | 2.3 °C | 13.3 °C | 897.91 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |