On Christmas Day, Ironwood climbed to a high temperature of minus 7°F (-21.7°C) zero, making it the coldest Christmas in Ironwood since 1933, according to the the National Weather Service.
In 1933, Ironwood’s high temperature was -8 degrees.
See low temps at many other Michigan towns:
http://www.mlive.com/weather/index.ssf/2017/12/coldest_christmas_since_1933_r.html