The extent of the ice cover for the five Great Lakes as of last week:
— Lake Erie, 95.8 percent.
— Lake Huron, 95.5 percent.
— Lake Superior, 94.6 percent.
— Lake Michigan, 82.3 percent.
— Lake Ontario, 43.4 percent.
The amount of ice coverage depends on many factors. Certainly the ambient air temperature is key, but also wind, snow, and lake depth affect ice cover. The minimum and maximum depths of the lakes are:
— Lake Erie, 62 feet / 210 feet.
— Lake Huron, 195 feet / 750 feet.
— Lake Michigan, 279 feet / 925 feet.
— Lake Ontario, 283 feet / 802 feet.
— Lake Superior, 483 feet / 1,332 feet.
The two NASA photos below were taken last week.
Here are a couple photos/charts of Lake Superior.
The other record that has been broken this winter is the number of consecutive days with temperatures below freezing. The last time the Upper Peninsula saw temperatures above freezing was December 5th. That is 74 consecutive cold days. Today will probably end that streak since temps are supposed to rise to the mid-30s.