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While the temperature of the surface of Lake Superior varies seasonally, the temperature below 110 fathoms (660 ft; 200 m) is an almost constant 39 °F (4 °C). This variation in temperature makes the lake seasonally stratified .
Summers in Lake Superior Provincial Park are often cool due to the cold winds off Lake Superior. Summer is often slow to start due to the water on Lake Superior being so cold during May and June. During June and July, water temperatures are usually below 15 °C (59 °F) and as a result fog is frequent.
Lake Superior: Near to slightly above normal temperatures are forecast for January and February. Slightly below normal ice conditions. Slightly below normal ice conditions.
The island is known for its beaches on Lake Superior. Swimming is a less frequent activity because of the low water temperatures, although the beaches are a popular destination during the summer. The surface water temperature in the sheltered bay can rise to 70 °F (21 °C) while the water just off shore might remain at 50 °F (10 °C).
The state is nearly 500 miles (805 km) from any large body of water (with the exception of Lake Superior), and temperatures and precipitation vary widely. It is far enough north to experience −60 °F (−51 °C) temperatures and blizzards during the winter months, but far enough south to have 114 °F or 45.6 °C temperatures and tornado ...
Because of the moderating influence of Lake Superior, summer temperatures are cooler, winter temperatures warmer, and the seasonal temperature difference is smaller than locations farther inland. With average highs of just below 70 °F (21 °C) in July and August, Grand Marais has the coolest summer temperatures of any weather station in Minnesota.
Last summer, Lake Michigan was 10 degrees above normal, which resulted in the water taking longer to cool down in the winter. At the start of the year, only 3% of the Great Lakes were covered in ice.
Whitefish Point's land and water provides a natural corridor for birds that makes it a migratory route of world significance. [3] It is a designated Important Bird Area [ 4 ] where the Whitefish Point Bird Observatory [ 5 ] conducts important research.