The lowest temperature recorded in the winter in the US depends on the state. Different states had different low temperatures.
40 degrees
The lowest temperature recorded in the contiguous United States was -70°F (-57°C) in Rogers Pass, Montana on January 20, 1954. The lowest temperature recorded in all of the United States, including Alaska and Hawaii, was -80°F (-62°C) in Prospect Creek, Alaska on January 23, 1971.
it was something like -81 in alaska of course. i cant remember which year this was.
-70 at Roger's Pass http://www.currentresults.com/Weather-Extremes/US/coldest.php
The lowest level of groundwater in the US was recorded in the San Bernardino Basin area in California. Measured in volume, 500,000 acre-feet below full is the ground level of the basin and in recorded history the lowest point.
2.93%
southeast
The lowest minimum temperature ever recorded in Wisconsin was on February 2nd and 4th of 1996, when a temperature of -55 F was recorded at Couderay, Wisconsin. Incidentally, that is the record for the coldest temperature ever recorded in the US, east of the Mississippi River. Now, strictly speaking, that would have been the coldest night in Wisconsin on record. I couldn't find the lowest maximum temperature record for Wisconsin, but I did find that the high temp in Eau Claire on February 2, 1996 was -19 F. That's a pretty cold day, even by Wisconsin standards.
Zero, in parts of the south and also West Coast, recorded every year.
West region
It depends on what state you're in.
Tuscon, nevada