Probably more to it than temp differential but… 353 SXUS83 KLOT 091456 OMRLOT ILZ104-101600- SOUTHERN LAKE MICHIGAN WATER TEMPERATURES NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 856 AM CST Sun Feb 9 2025 LAKE MICHIGAN WATER TEMPERATURES... CHICAGO SHORE...........32. CHICAGO CRIB............37. MICHIGAN CITY...........33. SOUTH MID LAKE BUOY.....40. && M IS FOR MISSING DATA THAT IS NORMALLY AVAILABLE. THE MICHIGAN CITY WATER TEMPERATURE SENSOR IS LOCATED AT A WATER INTAKE ONE MILE OFFSHORE AND 60 FEET BELOW THE WATER SURFACE. IT IS READ EVERY DAY OF THE YEAR. FOR LAKE MICHIGAN WATER LEVELS, PLEASE SEE: WWW.LRD.USACE.ARMY.MIL/WATER-INFORMATION/WATER-MANAGEMENT /GREAT-LAKES-AND-HARBORS/WATER-LEVEL-FORECASTS $$ .