Going to do a compilation of records for each U.S. state outside of just record low and record high (such as record low max, record high min, coldest/hottest 30-day means, greatest 24 hour rainfall, snowfall, etc). I will start with record cold maximums per state (minimum for the day in parenthesis). Countrywide records will be highlighted. Sources: xMACIS, NOWData
Alabama: 1 F (-17.2 C); Russellville No. 2, Bridgeport 5 NW; January 21, 1985 (lows were -14 F (-25.6 C) and -13 F (-25.0 C) respectively))
Alaska:
-66 F (-54.4 C); Allakaket, Ambler; January 24, 1971 and January 27, 1989 (lows were -75 F (-59.4 C) and -74 F (-58.9 C respectively))
Arizona: -3 F (-19.4 C); Snowslide Canyon; February 2, 2011 (unable to find station on NOWData)
Arkansas: -2 F (-18.9 C); Fayetteville; February 12, 1899 (low was -24 F (-31.1 C))
California: -10 F (-23.3 C); White Mountain 2; December 14, 1967 (couldn't find station, but Bodie had a low of -18 F (-27.8 C) and a high of 0 F (-17.8 C) on this day)
Colorado: -21 F (-29.4 C); Jones Pass 2 E; January 12, 1963 (Jones Pass doesn't have data on Jan 1963, but Dillon, CO had a low of -38 F (-38.9 C) on this day)
Connecticut: -10 F (-23.3 C); Cream Hill; December 30, 1917 (Closest station with data in December 1917 is Glens Falls, NY, low of -34 F (-36.7 C)
Delaware: -3 F (-19.4 C); Milford 2 SE; February 12, 1899 (Low was -16 F (-26.7 C))
Florida: 22 F (-5.6 C); Tallahassee; February 13, 1899 (Low was -2 F (-18.9 C))
Georgia: 2 F (-16.7 C); Jasper 1 NNW, Dalton; January 21, 1985 (Lows were -14 F (-25.6 C) and -12 F (-24.4 C) respectively)
Hawaii: 28 F (-2.2 C); Mauna Kea Observatory; January 7, 1980 (Low temp data unavailable)
Idaho: -25 F (-31.7 C); Grimes Pass; December 29, 1915 (Low temp data unavailable)
Illinois: -17 F (-27.2 C); Paw Paw 2 S; February 3, 1996 (Low was -33 F (-36.7 C))
Indiana: -15 F (-26.1 C); Angola; January 31, 2019 (Low was -23 F (-30.6 C)
Iowa: -28 F (-33.3 C); Rock Rapids; February 8, 1899 (Low was -36 F (-37.8 C))
Kansas: -13 F (-25.0 C); Dodge City; January 13, 1875 (Low was -20 F (-28.9 C))
Kentucky: -8 F (-22.2); Cave Run Lake; January 21, 1985 (Low was -20 F (-28.9))
Louisiana: 10 F (-12.2 C); Lake Charles; February 12, 1899 (Low was 3 F (-16.1 C))
Maine: -22 F (-30.0 C); Brassua Dam; February 16, 1943 (Low was -30 F (-34.4 C))
Maryland: -5 F (-20.6 C); Oakland; January 21, 1985 (Low was -24 F (-31.1 C))
Massachusetts: -5 F (-20.6 C); Belchertown; February 15, 1943 (Low was -23 F (-30.6 C)) **
Michigan: -22 F (-30.0 C) Bergland Dam, Ironwood; January 19, 1994 (Lows were -34 F (-36.7 C) and -31 F (-35.0 C))
Minnesota: -39 F (-39.4 C); Roseau; February 8, 1899 (Low was -48 F (-44.4 C))
Mississippi: 4 F (-15.6 C); Oxford University; January 21, 1985 (Low was -13 F (-25.0 C))
Missouri: -16 F (-26.7 C); Maryville 2 E; February 11, 1899 (Low was -27 F (-32.8 C))
Montana: -38 F (-38.9 C); Havre; January 27, 1916 (Low was -57 F (-49.4 C)) (EDIT: -40 F (-40 C) at Fort Logan; February 1, 1893)
Nebraska: -21 F (-29.4 C); Mullen 3S; February 8, 1936 (Low was -36 F (-37.8 C))
Nevada: -18 F (-27.8 C); Big Bend; December 22, 1990 (Low temp data unavailable)
New Hampshire: -28 F (-33.3 C); Mount Washington; February 6, 1995 (Low was -39 F (-39.4 C))
New Jersey: -3 F (-19.4 C); Charlotteburg Reservoir; December 31, 1917 (Low was -15 F (-26.1 C))
New Mexico: -7 F (-21.7 C); Taos Powderhorn; February 2, 2011 (Low was -20 F (-28.9 C))
New York: -21 F (-29.4 C); Tupper Lake Sunmount, Gouvernuor 3 NW; February 15, 1943, January 4, 1981 (Lows were -37 F (-38.3 C) and -45 F (-42.8 C) respectively)
North Carolina: -10 F (-23.3 C); Grandfather Mountain; January 21, 1985 (Low was -32 F (-35.6 C)
North Dakota: -38 F (-38.9 C); Westhope; January 6, 1909 (Low temp at Bottineau was -41 F with a -32 F high)
Ohio: -13 F (-25.0 C); Bellefontaine; January 19, 1994 (Low was -27 F (-32.8 C))
Oklahoma: -4 F (-20.0 C); Arnett 3 NE; January 12, 1912 (Low was -18 F (-27.8 C))
Oregon: -18 F (-27.8 C); Silvies; December 22, 1990 (Seneca is the closest station, low of -36 F (-37.8 C) with a high of -5 F (-20.6 C)
Pennsylvania: -16 F (-26.7 C); Bradford Regional Airport; January 17, 1982 (Low was -27 F (-32.8 C)). ** -20 F high was apparently recorded in Honesdale, PA on January 22, 1948, but couldn't find the station
Rhode Island: -5 F (-20.6 C); Kingston; February 5, 1918 (Low was -13 F (-25.0 C))
South Carolina: 4 F (-15.6 C); Caesar's Head; January 27, 1986 (Low was -5 F (-20.6 C))
South Dakota: -30 F (-34.4 C); Usta 8 WNW; December 22, 1989 (Low was -33 F at Bison with a high of -17 F)
Tennessee: -10 F (-23.3 C); Crossville EXP Station; January 21, 1985 (Low was -25 F (-31.7 C))
Texas: -8 F (-22.2 C); Stratford; February 7 and 9, 1933 (Low was -20 F (-28.9 C) both days)
Utah: -18 F (-27.8 C); Woodruff; December 22, 1990 (Low was -40 F (-40.0 C) **-38 F high was apparently recorded in Nutter Ranch, but that sounds like BS to me
Vermont: -24 F (-31.1 C); Mount Mansfield; January 15, 2004 (Low was -36 F (-37.8 C))
Virginia: -10 F (-23.3 C); Mountain Lake Biological Station; January 21, 1985 (Low was -18 F (-27.8 C) at Pearisburg with a high of 3 F (-16.1 C))
Washington: -21 F (-29.4 C); Winthrop; December 30, 1968 (Low was -48 F (-44.4 C) **High of -58 F at Cliff Ridge and -32 F at Rainier OHANAPECOSH but very dubious readings
West Virginia: -16 F (-26.7 C); Snowshoe; January 11, 1982 (Low for that day is missing)
Wisconsin: -28 F (-33.3 C); Minocqua; January 19, 1994 (Low for that day is missing
)
Wyoming: -30 F (-34.4 C); Heart Mountain; February 2, 1989 (Cody had a low of -37 F (-38.3 C) with a high of -24 F (-31.1 C))
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