Sebago Lake is quite the sight right now, freezing spray and slush waves everywhere. Car thermometer is at -4. Made me think of this ice out date chart for the Lake. The points on the x axis are dates when the big bay didn't freeze. The clusters in the last two decades will surprise no one, but interesting to note the cluster in the 40's and 50's, which others here have noted was not a good winter stretch. Take the data pre 1900 with a grain of salt as well.