the coldest temperature in the U.S., -80 °F, was observed at Prospect Creek, Alaska

What are the lowest temperatures recorded in the U.S.?

All-Time Record Minimum Temperature by State

(Indicated records marked by * are based upon WunderGround.com articles here and here.)
State Location Record Low Date
Alabama New Market -27 °F January 30, 1966
Arizona Hawley Lake -40 °F January 7, 1971
Arkansas Brook Farm Pond (near Gravette) -29 °F February 13, 1905
California Boca -45 °F January 20, 1937
Colorado Maybell -61 °F February 1, 1985
*Connecticut Norfolk Valley station *-37 °F February 16, 1943
Delaware Millsboro -17 °F January 17, 1893
Florida Tallahassee -2 °F February 13, 1899
Georgia CCC Fire Camp F-16 (nr. Beatum) -17 °F January 27, 1940
*Hawaii Mauna Kea Observatory (Hawaii) *15 °F January 5, 1975
Idaho Island Park Dam -60 °F January 18, 1943
Illinois Congerville -36 °F January 5, 1999
Indiana New Whiteland -36 °F January 19, 1994
Iowa Washta
Elkader
-47 °F January 12, 1912
February 3, 1996
Kansas Lebanon -40 °F February 13, 1905
Kentucky Shelbyville -37 °F January 19, 1994
Louisiana Minden -16 °F February 13, 1899
Maine Big Black River (nr. Saint Pamphile, PQ) -50 °F January 16, 2009
Maryland Oakland -40 °F January 13, 1912
*Massachusetts Taunton
Coldbrook
Chester
*-40 °F January 22, 1984
Michigan Vanderbilt -51 °F February 9, 1934
Minnesota Tower -60 °F February 2, 1996
Mississippi Corinth -19 °F January 30, 1966
Missouri Warsaw -40 °F February 13, 1905
Montana Rogers Pass -70 °F January 20, 1954
Nebraska Bridgeport
Oshkosh
-47 °F February 12, 1899
December 22, 1989
Nevada San Jacinto -50 °F January 8, 1937
New Hampshire Mount Washington -46 °F January 8, 1968
New Jersey River Vale -34 °F January 5, 1904
New Mexico Gavilan -50 °F February 1, 1951
New York Old Forge -52 °F February 18, 1979
North Carolina Mount Mitchell -34 °F January 21, 1985
North Dakota Parshall -60 °F February 15, 1936
Ohio Milligan -39 °F February 10, 1899
Oklahoma Tipton -31 °F February 10, 2011
Oregon Ukiah
Seneca
-54 °F February 9, 1933
February 10, 1933
Pennsylvania Smethport -42 °F January 5, 1904
Rhode Island Wood River Junction -28 °F January 11, 1942
*South Carolina Hogback Mountain *-22 °F January 21, 1985
South Dakota McIntosh -58 °F February 17, 1936
Tennessee Mountain City -32 °F December 30, 1917
Texas Seminole -23 °F February 8, 1933
Utah Strawberry Tunnel (East) -50 °F January 5, 1913
Vermont Bloomfield -50 °F December 30, 1933
Virginia Mountain Lake Biological Station -30 °F January 21, 1985
Washington Mazama
Winthrop
-48 °F December 30, 1968
West Virginia Lewisburg -37 °F December 30, 1917
Wisconsin Couderay -55 °F February 2 & 4, 1996
*Wyoming Moran *-63 °F February 9, 1933
Alaska Prospect Creek Camp -80 °F January 23, 1971
Puerto Rico Aibonito
San Sebastian
Rincon
40 °F March 9, 1911
January 24, 1966
March 27, 1985
Virgin Islands Anna's Hope (SC) 51 °F January 31, 1954
(page last updated 9/14/2011)
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