Sauk City, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.6 °F (low) to 57 °F (high). Annual precipitation averages 36.3 Inches. Sauk City is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.7 °F | 27.4 °F | 1.31 in. |
| February | 12.0 °F | 31.7 °F | 1.31 in. |
| March | 23.4 °F | 43.5 °F | 2.0 in. |
| April | 35.0 °F | 57.2 °F | 3.77 in. |
| May | 46.9 °F | 69.4 °F | 4.22 in. |
| June | 57.7 °F | 79.1 °F | 5.48 in. |
| July | 61.4 °F | 82.7 °F | 4.39 in. |
| August | 58.9 °F | 80.8 °F | 4.16 in. |
| September | 50.7 °F | 73.6 °F | 3.44 in. |
| October | 39.0 °F | 60.8 °F | 2.7 in. |
| November | 27.6 °F | 45.4 °F | 2.02 in. |
| December | 16.9 °F | 32.9 °F | 1.52 in. |
| Annual | 36.6 °F | 57 °F | 36.32 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |