Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet).
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Though not as warm as the oceans, temperatures of Lake Michigan do rise to the high 60s in July and August to make swimming enjoyable, and definitely refreshing! Rarely do temperatures make it to the 70s, unless air temperatures stay up in the 90's for many continuous days.
A north-northeast wind has pushed the warmer surface water along the Michigan shore back toward the middle of Lake Michigan and brought up colder water from well beneath the surface. This process is called upwelling.
Lake Superior is the world's largest freshwater lake by area (31,700 mi2 /82,100 km2). It is also the coldest and deepest of the Great Lakes, with a maximum depth of 406 meters (1,332 feet). By most measures, it is the healthiest of all the Great Lakes.
Though not as warm as the oceans, temperatures of Lake Michigan do rise to the high 60s in July and August to make swimming enjoyable, and definitely refreshing! Rarely do temperatures make it to the 70s, unless air temperatures stay up in the 90's for many continuous days.
Lake Surface TemperatureSurface temperatures of Lake Michigan follow a monthly pattern with the warmest temperatures occurring in late summer and early fall and the coolest temperatures occurring in late winter and early spring (Figure 17).
Lower Michigan is surrounded by water on the north, east and west. Any wind from those directions will blow air over the water and then over Lower Michigan. The cold water will cool the air and keep us in a chill. It's a nice cooling effect on a hot summer day, but it's a frigid effect in April and May.
Those who brave the frigid feat and swim in the winter are nicknamed “ice monsters.” Lake Michigan continuously cools throughout winter, and with March averaging an annual low of 32.9 degrees, it's the chilliest month for open-water swimming.
According to the U.S. National Ice Center at NOAA, ice thickness ranges from two to six inches in most places. Thicker ice, of a foot or more, is forming in Little and Big Bays De Noc in Lake Michigan; Black and Nipigon Bays in Ontario, and Wisconsin's Chequamegon Bay in Lake Superior.
'Pancake ice' forms on Lake Michigan in below-freezing temperatures. Pancake ice formations occur when ice sheets are broken into pieces by the wind and waves.
Lake Erie is the shallowest, warmest, and most productive of the Great Lakes. Three distinct basins provide a variety of offshore habitats. The Detroit River, Maumee River, and smaller tributaries drain into the western basin, which averages 24 feet deep and contains extremely nutrient-rich water.
The Great Lakes are fascinating and a dream come true for swimmers. Yes, we can all swim in the Great Lakes. It's even possible to swim in all five Great Lakes in less than 24 hours!