Potosi, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.1 °F (low) to 56.8 °F (high). Annual precipitation averages 38.1 Inches. 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 | 10.5 °F | 26.7 °F | 1.26 in. |
| February | 13.9 °F | 31.2 °F | 1.4 in. |
| March | 25.6 °F | 43.8 °F | 2.01 in. |
| April | 37.0 °F | 57.6 °F | 3.82 in. |
| May | 48.6 °F | 69.4 °F | 4.48 in. |
| June | 59.0 °F | 78.9 °F | 5.75 in. |
| July | 62.8 °F | 82.1 °F | 4.87 in. |
| August | 60.7 °F | 80.4 °F | 3.91 in. |
| September | 52.4 °F | 73.6 °F | 3.87 in. |
| October | 40.4 °F | 60.5 °F | 2.87 in. |
| November | 28.5 °F | 45.2 °F | 2.2 in. |
| December | 17.4 °F | 32.4 °F | 1.67 in. |
| Annual | 38.1 °F | 56.8 °F | 38.11 in. |
| 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 : -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 |