Potosi, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 13.8 °C (high). Annual precipitation averages 968 Millimeters. Potosi is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.9 °C | -2.9 °C | 32 mm |
| February | -10.1 °C | -0.4 °C | 35.56 mm |
| March | -3.6 °C | 6.6 °C | 51.05 mm |
| April | 2.8 °C | 14.2 °C | 97.03 mm |
| May | 9.2 °C | 20.8 °C | 113.79 mm |
| June | 15 °C | 26.1 °C | 146.05 mm |
| July | 17.1 °C | 27.8 °C | 123.7 mm |
| August | 15.9 °C | 26.9 °C | 99.31 mm |
| September | 11.3 °C | 23.1 °C | 98.3 mm |
| October | 4.7 °C | 15.8 °C | 72.9 mm |
| November | -1.9 °C | 7.3 °C | 55.88 mm |
| December | -8.1 °C | 0.2 °C | 42.42 mm |
| Annual | 3.4 °C | 13.8 °C | 967.99 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |