Check out for water temperature variations of various Chicago beaches for the years 2014, 2015 and 2016. The data was automatically captured by sensors during each hour of the day.

View temperatures for different times during the day using the dropdown.

There are gaps in the data which is why the graph appears broken at various points.

Data From: https://data.cityofchicago.org/Parks-Recreation/Beach-Water-Quality-Automated-Sensors/qmqz-2xku/data