Heavy June rain brings late emergence of mosquitoes in Illinois Jul 20, 2021 11:15 am by The Center Square (Chicago)Illinois in the News Share on Facebook Tweet Email Images The Center Square (July 19) 'When you have a very heavy rainfall event like we have seen here in Illinois over the past couple of weeks, it’s not unusual that after that you would see large numbers of mosquitos,' says U of I's Chris Stone. Share on Facebook Tweet Email