Historical Ice Breakup Dates for Chequamegon Bay, Lake Superior, 1911 to 2019 (ver. 2.0, May 2019)
Ice breakup dates of Chequamegon Bay, Lake Superior from 1911 to 2019.  Ice breakup date is the day in spring when winter ice cover substantially leaves a water body.  Local residents deem "ice breakup" as when the ice moves northeast of a line straight across Chequamegon Bay out from Ellis Avenue (State highway 13). …