Midnight Update: The standard deviation of the U.S. annual average temperatures is 0.92, so the new record exceeds the old one by over 1 standard deviation. It's also more than 3.4 standard deviations from the average. According to a public domain table of the normal distribution, the odds of this are 0.0003369. If the distribution were truly random (hint, it ain't), this would be a once in 2968 year event.
Original Post:
The National Climatic Data Center's preliminary report, released within the last hour, confirms that 2012 was the record warmest year for the U.S. by an incredible margin of 1.0°F. All 48 contiguous states were warmer than average for the year, 19 had record warm years, and 26 more had top 10 warmest years. At least 356 individual locations tied or broke their all-time record high temperatures. This included at least one location in every state except Washington.
The NCDC chart of year-to-date temperatures (click to enlarge) to the right shows that the extremely warm January and March put 2012 firmly in first place for warmest year and the wide margin was maintained through December.
The chart of warmest 12-month periods shows that 10 of the top 12 ended in 2012.
From the NCDC report:
In 2012, the contiguous United States (CONUS) average annual temperature of 55.3°F was 3.3°F above the 20th century average, and was the warmest year in the 1895-2012 period of record for the nation. The 2012 annual temperature was 1.0°F warmer than the previous record warm year of 1998. Since 1895, the CONUS has observed a long-term temperature increase of about 0.13°F per decade.
On a statewide and seasonal level, 2012 was a year of both temperature and precipitation extremes for the United States. Each state in the CONUS had annual temperatures which were above average. Nineteen states, stretching from Utah to Massachusetts, had annual temperatures which were record warm. An additional 26 states had one of their 10 warmest years. Only Georgia (11th warmest year), Oregon (12th warmest), and Washington (30th warmest) had annual temperatures that were not among the ten warmest in their respective period of records.
The preliminary list of individual all-time records from NCDC:
Date Location Record Previous/date
25-May CHILLY BARTON FLAT, ID 100°F 100°F (Jul 24, 2007)
23-Jun LAMAR MUNI AP, CO 110°F 109°F (Aug 1, 2008)
23-Jun COLORADO SPGS MUNI AP, CO 100°F 100°F (Jul 24, 2003)
23-Jun DENVER CENTENNIAL AP, CO 100°F 100°F (Aug 1, 2008)
23-Jun RUXTON PARK, CO 87°F 86°F (Oct 1, 2006)
24-Jun TRIBUNE 1W, KS 109°F 108°F (Jul 15, 2000)
24-Jun HARRISBURG 12WNW, NE 105°F 105°F (Jul 16, 2006)
24-Jun JUNEAU DWTN, AK 87°F 87°F (Jun 21, 1991)
25-Jun NORTON DAM, KS 113°F 111°F (Jul 7, 1991)
25-Jun COLBY 1SW, KS 112°F 110°F (Jun 25, 1971)
25-Jun TRIBUNE 1W, KS 111°F 109°F (1 day prior)
25-Jun OAKLEY 4W, KS 111°F 111°F (Jul 11, 1954)
25-Jun SIDNEY MUNICIPAL AIRPORT, NE 109°F 107°F (Jul 16, 2006)
25-Jun DENVER INTL AP, CO 105°F 105°F (Jul 20, 2005)
25-Jun KARVAL, CO 103°F 103°F (Jul 24, 2005)
25-Jun DENVER CENTENNIAL AP, CO 100°F 100°F (2 days prior)
26-Jun MC COOK, NE 115°F 114°F (Jul 20, 1932)
26-Jun LAMAR MUNI AP, CO 111°F 110°F (2 days prior)
26-Jun SIDNEY MUNICIPAL AIRPORT, NE 111°F 109°F (1 day prior)
26-Jun CEDAR BLUFF DAM, KS 110°F 110°F (Jul 15, 2003)
26-Jun DODGE CITY RGNL AP, KS 110°F 110°F (Jun 26, 2011)
26-Jun JUNCTION FAA AP, TX 108°F 108°F (Aug 28, 2011)
26-Jun DENVER INTL AP, CO 105°F 105°F (1 day prior)
26-Jun WHEAT RIDGE 2, CO 103°F 103°F (Jul 1, 1990)
26-Jun COLORADO SPGS MUNI AP, CO 101°F 100°F (2 days prior)
26-Jun EVERGREEN, CO 97°F 96°F (Jul 9, 2003)
27-Jun BENKELMAN, NE 114°F 114°F (Jul 11, 1954)
27-Jun LAMAR MUNI AP, CO 112°F 111°F (1 day prior)
27-Jun BREWSTER 4W, KS 112°F 112°F (Jul 21, 2005)
27-Jun SMITH CTR, KS 112°F 112°F (Jul 5, 1964)
27-Jun DODGE CITY RGNL AP, KS 111°F 110°F (1 day prior)
27-Jun YUMA, CO 111°F 109°F (Aug 3, 2008)
27-Jun LAMAR, CO 111°F 111°F (Jul 14, 1934)
27-Jun TRENTON DAM, NE 111°F 111°F (Aug 4, 1954)
27-Jun TRIBUNE 1W, KS 111°F 111°F (2 days prior)
27-Jun HOLYOKE, CO 110°F 110°F (Jul 11, 1954)
27-Jun SEDGWICK 5 S, CO 110°F 110°F (Jul 16, 2006)
27-Jun GARDEN CITY EXP STA, KS 109°F 109°F (Jun 30, 2011)
27-Jun EDGEMONT, SD 108°F 107°F (Jul 16, 2006)
27-Jun AKRON 4 E, CO 107°F 107°F (Jul 9, 1989)
27-Jun PUEBLO RSVR, CO 107°F 107°F (Jul 21, 2005)
27-Jun HARRISBURG 12WNW, NE 105°F 105°F (3 days prior)
27-Jun KARVAL, CO 104°F 103°F (2 days prior)
28-Jun NORTON DAM, KS 118°F 113°F (3 days prior)
28-Jun COLBY 1SW, KS 113°F 112°F (3 days prior)
28-Jun SMITH CTR, KS 113°F 112°F (1 day prior)
28-Jun GARDEN CITY EXP STA, KS 112°F 109°F (1 day prior)
28-Jun WALLACE, KS 112°F 112°F (Jul 20, 1917)
28-Jun JOHN MARTIN DAM, CO 111°F 111°F (Aug 4, 2008)
28-Jun LAMAR, CO 111°F 111°F (1 day prior)
28-Jun OAKLEY 4W, KS 111°F 111°F (3 days prior)
28-Jun TRIBUNE 1W, KS 111°F 111°F (1 day prior)
28-Jun LA JUNTA 20 S, CO 109°F 109°F (Jun 27, 1994)
28-Jun CAHOKIA ST LOUIS AP, IL 107°F 106°F (Sep 5, 1990)
28-Jun EVANSVILLE REGIONAL AP, IN 107°F 105°F (Jul 14, 1954)
28-Jun CARBONDALE SOUTHERN IL AP, IL 106°F 105°F (Jul 22, 1983)
28-Jun MUNCIE BALL STATE UNIV, IN 106°F 102°F (Jun 26, 1988)
28-Jun FORT WAYNE AP, IN 106°F 106°F (Jun 25, 1988)
28-Jun RICHMOND WTR WKS, IN 104°F 100°F (Sep 3, 2011)
28-Jun INDIANAPOLIS INTL AP, IN 104°F 104°F (Jul 14, 1954)
28-Jun BLOOMINGTON MONROE CO AP, IN 103°F 102°F (Jul 31, 1999)
28-Jun DAYTON WSO AP, OH 102°F 102°F (Aug 17, 1988)
28-Jun PONTIAC OAKLAND CO INTL AP, MI 99°F 98°F (Jul 21, 2011)
29-Jun COLUMBIA UNIV OF SC, SC 113°F 109°F (Aug 11, 2007)
29-Jun FESTUS, MO 111°F 110°F (Jul 16, 1980)
29-Jun RICHFIELD, KS 111°F 111°F (Jun 27, 2011)
29-Jun PERRYVILLE WTP, MO 110°F 109°F (Aug 3, 1964)
29-Jun CEDAR BLUFF DAM, KS 110°F 110°F (3 days prior)
29-Jun ATHENS BEN EPPS AP, GA 109°F 107°F (Aug 21, 1983)
29-Jun COLUMBIA METRO AP, SC 109°F 107°F (Aug 10, 2007)
29-Jun NASHVILLE ASOS, TN 109°F 107°F (Jul 28, 1952)
29-Jun DORA 1N, MO 109°F 109°F (Jul 6, 1966)
29-Jun KASKASKIA RVR NAV LOCK, IL 109°F 109°F (Aug 17, 1988)
29-Jun PADUCAH BARKLEY AP, KY 108°F 106°F (Jul 28, 1952)
29-Jun TERRE HAUTE INDIANA ST, IN 108°F 104°F (Sep 6, 1954)
29-Jun CAPE GIRARDEAU FAA AP, MO 107°F 105°F (Jul 15, 1980)
29-Jun CARBONDALE SOUTHERN IL AP, IL 107°F 106°F (1 day prior)
29-Jun FAYETTEVILLE WTP, TN 107°F 105°F (Aug 23, 2007)
29-Jun NEW CASTLE 3 SW, IN 107°F 103°F (Jun 26, 1988)
29-Jun PROVIDENCE, KY 107°F 106°F (Aug 17, 2007)
29-Jun VINCENNES 5 NE, IN 107°F 104°F (Jun 26, 1988)
29-Jun BANKHEAD LOCK & DAM, AL 107°F 107°F (Jul 8, 1977)
29-Jun EVANSVILLE REGIONAL AP, IN 107°F 107°F (1 day prior)
29-Jun MUSCLE SHOALS AP, AL 107°F 107°F (Aug 15, 2007)
29-Jun CHEATHAM , TN 106°F 105°F (Aug 23, 1983)
29-Jun HUNTINGTON, IN 106°F 105°F (Jun 26, 1988)
29-Jun HUNTSVILLE INTL AP, AL 106°F 105°F (Aug 16, 2007)
29-Jun CHATTANOOGA AP, TN 106°F 106°F (Jul 28, 1952)
29-Jun COLUMBUS METO AP., GA 105°F 104°F (Aug 10, 2007)
29-Jun LONDON FAA AP, KY 105°F 102°F (Aug 16, 2007)
29-Jun GADSDEN, AL 105°F 105°F (Aug 16, 1954)
29-Jun GRNVL SPART INTL AP, SC 105°F 105°F (Aug 10, 2007)
29-Jun QUANTICO MCAS, VA 105°F 105°F (Sep 7, 1954)
29-Jun RALEIGH AP, NC 105°F 105°F (Aug 21, 2007)
29-Jun JACKSON WSO, KY 104°F 101°F (Aug 18, 1988)
29-Jun CARLYLE RSVR, IL 104°F 104°F (Aug 16, 2007)
29-Jun CHARLOTTE DOUGLAS AP, NC 104°F 104°F (Aug 10, 2007)
29-Jun SPARTA WASTEWATER PLANT, TN 104°F 104°F (Jul 17, 1980)
29-Jun ATLANTA PEACHTREE AP, GA 103°F 102°F (Aug 22, 2007)
29-Jun TIPTON 5 SW, IN 103°F 98°F (Jul 22, 2011)
29-Jun BLOOMINGTON MONROE CO AP, IN 103°F 103°F (1 day prior)
29-Jun HUNTINGTON TRI ST AP, WV 103°F 103°F (Aug 16, 2007)
29-Jun WARSAW, IN 103°F 103°F (Jul 14, 1976)
29-Jun CROSSVILLE AP, TN 102°F 101°F (Jul 16, 1980)
29-Jun BRISTOL AP, TN 102°F 102°F (Jul 29, 1952)
29-Jun PITTSBURGH ALLEGHENY AP, PA 99°F 99°F (Aug 27, 1948)
29-Jun BLUEFIELD MERCER CO AP, WV 97°F 96°F (Jul 16, 1988)
29-Jun BECKLEY RALEIGH COUNTY AP, WV 96°F 96°F (Aug 17, 1988)
30-Jun JOHNSTON 4 SW, SC 113°F 110°F (Aug 11, 2007)
30-Jun REIDSVILLE 2 NW, NC 110°F 103°F (Aug 19, 1988)
30-Jun SIKESTON PWR STN, MO 110°F 107°F (Jul 17, 1980)
30-Jun WOODBURY 1 WNW, TN 110°F 109°F (Aug 17, 2007)
30-Jun KINGSTON SPRINGS, TN 109°F 108°F (Aug 16, 2007)
30-Jun SANDHILL RSCH ELGIN, SC 109°F 106°F (Aug 8, 2007)
30-Jun COLUMBIA 3 WNW, TN 109°F 109°F (Jul 28, 1952)
30-Jun COLUMBIA METRO AP, SC 109°F 109°F (1 day prior)
30-Jun SALUDA, SC 109°F 109°F (Jul 14, 1980)
30-Jun CHEATHAM , TN 108°F 106°F (1 day prior)
30-Jun SPARTA WASTEWATER PLANT, TN 108°F 104°F (1 day prior)
30-Jun MACON MIDDLE GA AP, GA 108°F 108°F (Jul 13, 1980)
30-Jun MAMMOTH CAVE, KY 108°F 108°F (Jul 27, 1952)
30-Jun BARREN RIVER LAKE, KY 107°F 106°F (Jul 10, 1988)
30-Jun CHATTANOOGA AP, TN 107°F 106°F (1 day prior)
30-Jun MARTIN U OF T BRANCH E, TN 107°F 106°F (Aug 18, 2007)
30-Jun ROME WSO AP, GA 107°F 106°F (Jul 17, 1980)
30-Jun MUSCLE SHOALS AP, AL 107°F 107°F (1 day prior)
30-Jun SANDERSVILLE, GA 107°F 107°F (Jul 22, 1986)
30-Jun SELMER, TN 107°F 107°F (Aug 16, 2007)
30-Jun ATLANTA HARTSFIELD AP, GA 106°F 105°F (Jul 17, 1980)
30-Jun CELINA, TN 106°F 105°F (Jul 17, 1980)
30-Jun COLUMBUS METO AP., GA 106°F 105°F (1 day prior)
30-Jun PORTLAND SEWAGE PLT, TN 106°F 105°F (Aug 17, 2007)
30-Jun PULASKI WWTP, TN 106°F 105°F (Jul 17, 1980)
30-Jun ROANOKE RAPIDS, NC 106°F 104°F (Aug 10, 2007)
30-Jun SMITHLAND , IL 106°F 104°F (Aug 17, 2007)
30-Jun ST LOUIS SCI CTR, MO 106°F 105°F (Jul 30, 1999)
30-Jun BARBOURVILLE, KY 106°F 106°F (Sep 5, 1954)
30-Jun CAIRO 3N, IL 106°F 106°F (Aug 9, 1930)
30-Jun FARMVILLE 2 N, VA 106°F 106°F (Sep 1, 1932)
30-Jun RUSSELLVILLE NO 2, AL 106°F 106°F (Aug 16, 2007)
30-Jun SPRINGFIELD EXP STN, TN 106°F 106°F (Aug 17, 2007)
30-Jun STONY CREEK 2 N, VA 106°F 106°F (Aug 23, 1983)
30-Jun ATLANTA PEACHTREE AP, GA 105°F 103°F (1 day prior)
30-Jun KNOXVILLE AP, TN 105°F 104°F (Jul 12, 1930)
30-Jun LOGAN, WV 105°F 104°F (Jul 15, 1954)
30-Jun MONTICELLO 3 NE, KY 105°F 103°F (Aug 18, 1988)
30-Jun PHILPOTT DAM 2, VA 105°F 102°F (Aug 22, 1983)
30-Jun SMITHVILLE 2 SE, TN 105°F 104°F (Jul 17, 1980)
30-Jun TAPOCO, NC 105°F 103°F (Jun 17, 1944)
30-Jun BROOKPORT DAM 52, IL 105°F 105°F (Jul 30, 1999)
30-Jun CLEVELAND FLTR PLT, TN 105°F 105°F (Jul 17, 1980)
30-Jun RALEIGH AP, NC 105°F 105°F (1 day prior)
30-Jun AMELIA COURTHOUSE 1, VA 104°F 102°F (Jul 6, 1999)
30-Jun CARLYLE RSVR, IL 104°F 104°F (1 day prior)
30-Jun CHARLOTTE DOUGLAS AP, NC 104°F 104°F (1 day prior)
30-Jun DALLAS 7 NE, GA 104°F 104°F (Aug 23, 2007)
30-Jun DRESDEN, TN 104°F 104°F (Aug 17, 2007)
30-Jun WEST PELZER 2 W, SC 104°F 104°F (Jul 21, 1986)
30-Jun BAXTER, KY 103°F 101°F (Aug 22, 1983)
30-Jun BRISTOL AP, TN 103°F 102°F (1 day prior)
30-Jun MONTEREY, TN 103°F 100°F (Jul 29, 1952)
30-Jun TAZEWELL, TN 103°F 102°F (Aug 22, 1983)
30-Jun WATERVILLE 2, NC 103°F 101°F (Jul 10, 1936)
30-Jun CAMP PICKETT, VA 103°F 103°F (Jul 27, 2010)
30-Jun JAMESTOWN WWTP, KY 103°F 103°F (Jul 17, 1980)
30-Jun LEXINGTON BLUEGRASS AP, KY 103°F 103°F (Jul 30, 1999)
30-Jun HELEN, GA 102°F 100°F (Jul 20, 1986)
30-Jun W KERR SCOTT RSVR, NC 102°F 102°F (Aug 19, 1988)
30-Jun ERWIN 1 W, TN 101°F 101°F (Aug 21, 1983)
30-Jun PULASKI 2 E, VA 99°F 99°F (Jul 18, 1986)
30-Jun PISGAH FOREST 3 NE, NC 98°F 98°F (Jun 23, 1964)
30-Jun WYTHEVILLE 1 S, VA 98°F 98°F (Aug 14, 2010)
30-Jun BUCKEYE, WV 97°F 97°F (Jul 23, 2011)
30-Jun COOPERS ROCK SF, WV 92°F 92°F (Jul 17, 1988)
1-Jul MILLEDGEVILLE, GA 110°F 110°F (Aug 20, 1925)
1-Jul SANTUCK, SC 110°F 110°F (Sep 4, 1925)
1-Jul CELINA, TN 109°F 106°F (1 day prior)
1-Jul SANDERSVILLE, GA 109°F 107°F (1 day prior)
1-Jul SILOAM 3N, GA 109°F 107°F (Aug 21, 1983)
1-Jul SALUDA, SC 109°F 109°F (1 day prior)
1-Jul BARREN RIVER LAKE, KY 108°F 107°F (1 day prior)
1-Jul ROME WSO AP, GA 108°F 107°F (1 day prior)
1-Jul CARTERSVILLE, GA 108°F 108°F (Aug 27, 1954)
1-Jul MACON MIDDLE GA AP, GA 108°F 108°F (1 day prior)
1-Jul GRNVL SPART INTL AP, SC 107°F 105°F (2 days prior)
1-Jul CHATTANOOGA AP, TN 107°F 107°F (1 day prior)
1-Jul LAURINBURG, NC 107°F 107°F (Aug 9, 2007)
1-Jul TAPOCO, NC 106°F 105°F (1 day prior)
1-Jul MC MINNVILLE, TN 106°F 106°F (1 day prior)
1-Jul ALLATOONA DAM 2, GA 105°F 104°F (Jul 9, 1977)
1-Jul KNOXVILLE EXP STN, TN 105°F 102°F (Aug 17, 2007)
1-Jul ATLANTA PEACHTREE AP, GA 105°F 105°F (1 day prior)
1-Jul CLEVELAND FLTR PLT, TN 105°F 105°F (1 day prior)
1-Jul GADSDEN, AL 105°F 105°F (2 days prior)
1-Jul KNOXVILLE AP, TN 105°F 105°F (1 day prior)
1-Jul GREENEVILLE EXP STN, TN 104°F 103°F (Jul 29, 1952)
1-Jul CHARLOTTE DOUGLAS AP, NC 104°F 104°F (1 day prior)
1-Jul DALLAS 7 NE, GA 104°F 104°F (1 day prior)
1-Jul CARROLLTON, GA 103°F 103°F (Jul 17, 1980)
1-Jul JAMESTOWN WWTP, KY 103°F 103°F (1 day prior)
1-Jul LEXINGTON BLUEGRASS AP, KY 103°F 103°F (1 day prior)
1-Jul TAZEWELL, TN 103°F 103°F (1 day prior)
1-Jul ERWIN 1 W, TN 102°F 101°F (1 day prior)
1-Jul HELEN, GA 102°F 102°F (1 day prior)
1-Jul MURPHY, NC 100°F 99°F (Aug 23, 2007)
1-Jul PISGAH FOREST 3 NE, NC 98°F 98°F (1 day prior)
2-Jul LEWISBURG EXP STN, TN 112°F 110°F (Jul 29, 1930)
2-Jul SILOAM 3N, GA 110°F 109°F (1 day prior)
2-Jul WASHINGTON 2 ESE, GA 109°F 109°F (Jun 30, 1952)
2-Jul BARREN RIVER LAKE, KY 108°F 108°F (1 day prior)
2-Jul CARTERSVILLE, GA 108°F 108°F (1 day prior)
2-Jul ALLATOONA DAM 2, GA 106°F 105°F (1 day prior)
2-Jul ROCHESTER FERRY, KY 106°F 105°F (Aug 17, 2007)
2-Jul WEST PELZER 2 W, SC 106°F 104°F (2 days prior)
2-Jul WAYNE 2, WV 105°F 105°F (Jul 18, 1986)
2-Jul DALLAS 7 NE, GA 104°F 104°F (1 day prior)
2-Jul GREENEVILLE EXP STN, TN 104°F 104°F (1 day prior)
2-Jul LA GRANGE 1N, GA 104°F 104°F (Jul 25, 1952)
2-Jul CARROLLTON, GA 103°F 103°F (1 day prior)
2-Jul OPELIKA, AL 103°F 103°F (Aug 11, 2007)
2-Jul MURPHY, NC 100°F 100°F (1 day prior)
3-Jul CARTERSVILLE, GA 108°F 108°F (1 day prior)
3-Jul LA GRANGE 1N, GA 104°F 104°F (1 day prior)
3-Jul CASTLE ROCK, CO 100°F 99°F (Jul 6, 1973)
4-Jul BATTLE CREEK 5NW, MI 102°F 101°F (Jun 28, 1971)
4-Jul LONE ROCK TRI CO, WI 102°F 101°F (Jul 30, 1955)
4-Jul KALAMAZOO BATTLE CK INTL AP, MI 102°F 102°F (Jul 6, 1988)
4-Jul PONTIAC OAKLAND CO INTL AP, MI 100°F 99°F (6 days prior)
4-Jul LANSING CAPITAL CY AP, MI 100°F 100°F (Aug 1, 1988)
5-Jul CARBONDALE SOUTHERN IL AP, IL 107°F 107°F (6 days prior)
5-Jul EVANSVILLE REGIONAL AP, IN 107°F 107°F (6 days prior)
5-Jul MADISON DANE CO AP, WI 104°F 104°F (Jul 10, 1976)
5-Jul KALAMAZOO BATTLE CK INTL AP, MI 103°F 102°F (1 day prior)
5-Jul BLOOMINGTON MONROE CO AP, IN 103°F 103°F (6 days prior)
5-Jul MILWAUKEE MITCHELL AP, WI 103°F 103°F (Jul 13, 1995)
5-Jul OCONOMOWOC, WI 102°F 101°F (Aug 17, 1988)
5-Jul BATTLE CREEK 5NW, MI 102°F 102°F (1 day prior)
5-Jul LONE ROCK TRI CO, WI 102°F 102°F (1 day prior)
5-Jul HORICON, WI 101°F 101°F (Jul 14, 1995)
5-Jul BEAVER DAM, WI 100°F 100°F (Aug 17, 1988)
5-Jul BUCKEYE, WV 98°F 97°F (5 days prior)
6-Jul WOODBURY 1 WNW, TN 110°F 110°F (6 days prior)
6-Jul CAHOKIA ST LOUIS AP, IL 107°F 107°F (8 days prior)
6-Jul CARBONDALE SOUTHERN IL AP, IL 107°F 107°F (1 day prior)
6-Jul CARLYLE RSVR, IL 105°F 104°F (6 days prior)
6-Jul INDIANAPOLIS INTL AP, IN 105°F 104°F (8 days prior)
6-Jul CHICAGO BOTANIC GARDEN, IL 105°F 105°F (Jul 14, 1995)
6-Jul BLOOMINGTON MONROE CO AP, IN 104°F 103°F (1 day prior)
6-Jul COVINGTON WSO, KY 104°F 103°F (Jul 9, 1988)
6-Jul GERALD R FORD INTL AP, MI 104°F 102°F (Jun 20, 1953)
6-Jul KALAMAZOO BATTLE CK INTL AP, MI 104°F 103°F (1 day prior)
6-Jul NORMAL 4NE, IL 104°F 103°F (Aug 17, 1988)
6-Jul MONTELLO, WI 104°F 104°F (Jul 14, 1995)
6-Jul ROCKFORD AP, IL 104°F 104°F (Aug 16, 1988)
6-Jul SOUTH BOSTON, VA 104°F 104°F (Aug 23, 1983)
6-Jul BARABOO, WI 103°F 102°F (Aug 17, 1988)
6-Jul BATTLE CREEK 5NW, MI 103°F 102°F (1 day prior)
6-Jul LANSING CAPITAL CY AP, MI 103°F 100°F (2 days prior)
6-Jul CHENOA, IL 103°F 103°F (Aug 17, 1988)
6-Jul LEXINGTON BLUEGRASS AP, KY 103°F 103°F (5 days prior)
6-Jul BEAVER DAM, WI 102°F 100°F (1 day prior)
6-Jul HORICON, WI 102°F 101°F (1 day prior)
6-Jul WHITEWATER, WI 102°F 101°F (Aug 31, 1953)
6-Jul DAYTON WSO AP, OH 102°F 102°F (8 days prior)
6-Jul LONE ROCK TRI CO, WI 102°F 102°F (1 day prior)
6-Jul WEST CHICAGO DUPAGE AP, IL 100°F 100°F (Jul 24, 2005)
6-Jul MUSKEGON CO AP, MI 99°F 99°F (Aug 3, 1964)
6-Jul STOCKTON 3 NNE, IL 99°F 99°F (Jul 11, 1989)
7-Jul CAIRO 3N, IL 108°F 106°F (7 days prior)
7-Jul CAHOKIA ST LOUIS AP, IL 107°F 107°F (1 day prior)
7-Jul BLOOMINGTON MONROE CO AP, IN 106°F 104°F (1 day prior)
7-Jul QUANTICO MCAS, VA 106°F 105°F (8 days prior)
7-Jul LOUISVILLE INTL AP, KY 106°F 106°F (Jul 30, 1999)
7-Jul ST LOUIS SCI CTR, MO 106°F 106°F (7 days prior)
7-Jul LEXINGTON BLUEGRASS AP, KY 105°F 103°F (1 day prior)
7-Jul NORMAL 4NE, IL 105°F 104°F (1 day prior)
7-Jul ROCKFORD AP, IL 105°F 104°F (1 day prior)
7-Jul INDIANAPOLIS INTL AP, IN 105°F 105°F (1 day prior)
7-Jul WASHINGTON REAGAN AP, VA 105°F 105°F (Aug 17, 1997)
7-Jul HUNTINGTON TRI ST AP, WV 104°F 103°F (8 days prior)
7-Jul COVINGTON WSO, KY 104°F 104°F (1 day prior)
7-Jul MOLINE WSO AP, IL 104°F 104°F (Jun 25, 1988)
7-Jul PATUXENT RIVER NAS, MD 104°F 104°F (Jul 25, 2010)
7-Jul ARLINGTON UNIV FARM, WI 103°F 102°F (Aug 16, 1988)
7-Jul PARKERSBURG FAA AP, WV 103°F 102°F (Jul 16, 1988)
7-Jul STOUGHTON, WI 103°F 103°F (Aug 2, 1988)
7-Jul WARSAW, IN 103°F 103°F (8 days prior)
7-Jul FREEPORT WASTE WTP, IL 102°F 101°F (Aug 18, 1988)
7-Jul BEAVER DAM, WI 102°F 102°F (1 day prior)
7-Jul DAYTON WSO AP, OH 102°F 102°F (1 day prior)
7-Jul WHITEWATER, WI 102°F 102°F (1 day prior)
7-Jul HESPERIA 4 WNW, MI 101°F 100°F (Aug 21, 1955)
7-Jul AKRON CANTON WSO AP, OH 101°F 101°F (Jul 16, 1988)
7-Jul PRESTON, MN 101°F 101°F (Jul 14, 1995)
7-Jul WILMINGTON AIRBORNE PARK, OH 101°F 101°F (Jul 14, 1954)
7-Jul WEST CHICAGO DUPAGE AP, IL 100°F 100°F (1 day prior)
7-Jul PAINTER 2W, VA 99°F 99°F (Jul 27, 2005)
7-Jul PITTSBURGH ALLEGHENY AP, PA 99°F 99°F (8 days prior)
7-Jul COOPERS ROCK SF, WV 93°F 92°F (7 days prior)
8-Jul CHILLICOTHE 2S, MO 110°F 109°F (Aug 29, 1984)
8-Jul BREMO BLUFF, VA 109°F 107°F (Aug 8, 2007)
8-Jul NORMAL 4NE, IL 107°F 105°F (1 day prior)
8-Jul WELDON SPRING NWS, MO 107°F 107°F (Aug 30, 1984)
8-Jul QUANTICO MCAS, VA 106°F 106°F (1 day prior)
8-Jul ST LOUIS SCI CTR, MO 106°F 106°F (1 day prior)
8-Jul CARLYLE RSVR, IL 105°F 105°F (2 days prior)
8-Jul RALEIGH AP, NC 105°F 105°F (8 days prior)
8-Jul RATHBUN DAM, IA 105°F 105°F (Jul 23, 1983)
8-Jul SALEM, IL 105°F 105°F (Aug 20, 1983)
8-Jul FREEPORT WASTE WTP, IL 103°F 102°F (1 day prior)
8-Jul WAYNESBURG 1 E, PA 102°F 102°F (Jul 17, 1988)
8-Jul HANNIBAL LOCKS AND DAM, OH 101°F 100°F (Aug 15, 1988)
8-Jul STEVENSVILLE 2SW, MD 101°F 101°F (Jul 21, 1934)
8-Jul PAINTER 2W, VA 100°F 99°F (1 day prior)
8-Jul PIKE ISLAND , WV 100°F 100°F (Jul 17, 1988)
8-Jul WASHINGTON 3 NE, PA 100°F 100°F (Jul 17, 1988)
8-Jul COOPERS ROCK SF, WV 96°F 93°F (1 day prior)
8-Jul LAUREL MTN, PA 95°F 93°F (Jul 17, 1988)
9-Jul NOLIN RIVER LAKE, KY 110°F 110°F (8 days prior)
9-Jul FARMVILLE 2 N, VA 106°F 106°F (9 days prior)
9-Jul MONTICELLO, VA 100°F 100°F (Jul 7, 1999)
11-Jul BEAVER DAM, AZ 121°F 120°F (Jul 6, 2007)
11-Jul CALIENTE, NV 110°F 110°F (Jul 14, 1915)
12-Jul EVANSTON BURNS FLD, WY 93°F 93°F (Jul 23, 2006)
13-Jul SODA SPRINGS AP, ID 102°F 101°F (Jul 14, 2002)
17-Jul BURLINGTON 2S, IA 107°F 105°F (Aug 17, 1983)
17-Jul FLINT FCWOS, MI 101°F 101°F (Jul 14, 1995)
17-Jul PONTIAC OAKLAND CO INTL AP, MI 100°F 100°F (13 days prior)
19-Jul ST LOUIS SCI CTR, MO 106°F 106°F (11 days prior)
20-Jul POPLAR BLUFF, MO 113°F 112°F (Aug 9, 1930)
22-Jul SPRINGVIEW, NE 113°F 110°F (Jul 17, 2006)
23-Jul OTTUMWA INDUSTRIAL AP, IA 106°F 105°F (Aug 18, 1983)
24-Jul RATHBUN DAM, IA 106°F 105°F (16 days prior)
24-Jul MEMPHIS, MO 106°F 106°F (Jul 19, 1954)
24-Jul LE CLAIRE 14, IA 103°F 103°F (Aug 17, 1983)
25-Jul ST LOUIS SCI CTR, MO 106°F 106°F (6 days prior)
25-Jul GUTTENBERG 10, IA 103°F 103°F (Aug 28, 1948)
25-Jul DUBUQUE WSO AP, IA 101°F 101°F (Jul 31, 1988)
26-Jul ST LOUIS SCI CTR, MO 107°F 106°F (1 day prior)
26-Jul CASCADE, IA 103°F 103°F (Aug 1, 1988)
30-Jul JOHN REDMOND LAKE, KS 110°F 109°F (Sep 3, 2000)
31-Jul RALSTON, OK 113°F 112°F (Jul 6, 1996)
31-Jul DES ARC, AR 109°F 109°F (Aug 1, 1986)
2-Aug SEMINOLE, OK 113°F 113°F (Jul 19, 1936)
2-Aug WATONGA, OK 112°F 111°F (Aug 6, 1964)
2-Aug OKLAHOMA CITY WILL ROGERS AP, OK 112°F 112°F (1 day prior)
2-Aug KEYSTONE DAM, OK 110°F 110°F (Jul 31, 1986)
3-Aug OKLAHOMA CITY WILL ROGERS AP, OK 113°F 112°F (1 day prior)
3-Aug OOLOGAH DAM, OK 109°F 109°F (Jul 23, 1974)
4-Aug BURLINGTON 2S, IA 110°F 107°F (18 days prior)
24-Aug KANEOHE NAVY AIR STN, HI 96°F 91°F (Aug 27, 2006)
30-Aug HILL CITY, SD 101°F 101°F (Jul 30, 2006)
30-Aug ORLANDO SANFORD AP, FL 100°F 100°F (Jun 14, 2010)
14-Sep SAN DIEGO MONTGOMERY FLD, CA 107°F 107°F (Sep 27, 2010)
14-Sep KANEOHE NAVY AIR STN, HI 98°F 96°F (21 days prior)
9-Oct LIHUE WSO AP 1020.1, HI 91°F 90°F (Aug 30, 1996)