With New England under an Arctic blast, an all-time low temperature of -50° Fahrenheit (-45.6 C)was recorded in Maine on the morning of January 16.
The new record low was recorded at 7:30 a.m. EST at a U.S. Geological Survey (USGS) stream gauge on the Big Black River near Depot Mountain in northwestern Aroostook County.
The previous record, -48° Fahrenheit (-44.4 C), was set in Van Buren, Maine almost 84 years earlier, on January 19, 1925
http://www.erh.noaa.gov/car/News_Items/2009-02-10_item001.htm
Thanks to Adoni for this link