University of Wisconsin-Madison Department of Entomology
https://www.cbs58.com/news/bad-summer-for-wisconsin-mosquitoes-blamed-on-mild-winter The severity of the winter varied a lot across the state and was moderate to severe in the north. Patterns of rainfall are important drivers of mosquito abundance.
https://www.wearegreenbay.com/news/local-news/ne-wisconsin-s-mosquito-population-effected-by-relatively-dry-summer/1321421303
West Nile virus infection rates typically increase in mosquitoes at this time of year. 2018 surveillance is showing similar trends. Be sure to use repellents if you are in areas where mosquito biting is occurring.
Mosquito trapping started in Dane County and the Madison area in June. With all the rain in May and warmer temperatures, the mosquito season got off to a strong start. We trapped the highest overall numbers ever, with an average of 1826 mosquitoes per trap early in the season. This compares with 300 per trap, …
https://news.wisc.edu/study-bolsters-bats-reputation-as-mosquito-devourers/
http://www.nbc15.com/content/news/Mosquito-capable-of-spreading-Zika-found-in-Dane-County–435270813.html The Asian tiger mosquito was found in Wisconsin in both 2017 and 2018. Numbers are very low and the mosquito populations are extremely localized. Tests indicate that the eggs cannot survive a normal Wisconsin winter.
https://www.wpr.org/mosquito-capable-carrying-zika-found-wisconsin