Markesan, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.4 °F (low) to 55.8 °F (high). Annual precipitation averages 35.1 Inches. 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 | 10.0 °F | 26.2 °F | 1.4 in. |
| February | 12.1 °F | 29.9 °F | 1.33 in. |
| March | 23.1 °F | 41.9 °F | 1.93 in. |
| April | 34.7 °F | 55.8 °F | 3.48 in. |
| May | 46.6 °F | 68.3 °F | 4.22 in. |
| June | 56.6 °F | 77.8 °F | 5.0 in. |
| July | 60.6 °F | 81.6 °F | 4.21 in. |
| August | 58.6 °F | 79.8 °F | 3.7 in. |
| September | 50.6 °F | 72.9 °F | 3.33 in. |
| October | 39.0 °F | 59.6 °F | 2.83 in. |
| November | 27.7 °F | 44.5 °F | 2.06 in. |
| December | 16.6 °F | 31.5 °F | 1.64 in. |
| Annual | 36.4 °F | 55.8 °F | 35.13 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |