Markesan, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 13.2 °C (high). Annual precipitation averages 892.3 Millimeters. Markesan is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.2 °C | -3.2 °C | 35.56 mm |
| February | -11.1 °C | -1.2 °C | 33.78 mm |
| March | -4.9 °C | 5.5 °C | 49.02 mm |
| April | 1.5 °C | 13.2 °C | 88.39 mm |
| May | 8.1 °C | 20.2 °C | 107.19 mm |
| June | 13.7 °C | 25.4 °C | 127 mm |
| July | 15.9 °C | 27.6 °C | 106.93 mm |
| August | 14.8 °C | 26.6 °C | 93.98 mm |
| September | 10.3 °C | 22.7 °C | 84.58 mm |
| October | 3.9 °C | 15.3 °C | 71.88 mm |
| November | -2.4 °C | 6.9 °C | 52.32 mm |
| December | -8.6 °C | -0.3 °C | 41.66 mm |
| Annual | 2.4 °C | 13.2 °C | 892.29 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |