FILE - In this Aug. 16, 2012 file photo, dust is carried by the wind behind a combine harvesting corn in a field near Coy, Ark. A brutal combination of a widespread drought and a mostly absent winter pushed the average annual U.S. temperature last year up to 55.32 degrees Fahrenheit, the government announced Tuesday, Jan. 8, 2013. Breaking temperature records by an entire degree is unprecedented, scientists say. Normally, records are broken by a tenth of a degree or so. (AP Photo/Danny Johnston, File)

Associated Press
FILE - In this Aug. 16, 2012 file photo, dust is carried by the wind behind a combine harvesting corn in a field near Coy, Ark. A brutal combination of a widespread drought and a mostly absent winter pushed the average annual U.S. temperature last year up to 55.32 degrees Fahrenheit, the government announced Tuesday, Jan. 8, 2013. Breaking temperature records by an entire degree is unprecedented, scientists say. Normally, records are broken by a tenth of a degree or so. (AP Photo/Danny Johnston, File)
FILE - In this Aug. 16, 2012 file photo, dust is carried by the wind behind a combine harvesting corn in a field near Coy, Ark. A brutal combination of a widespread drought and a mostly absent winter pushed the average annual U.S. temperature last year up to 55.32 degrees Fahrenheit, the government announced Tuesday, Jan. 8, 2013. Breaking temperature records by an entire degree is unprecedented, scientists say. Normally, records are broken by a tenth of a degree or so. (AP Photo/Danny Johnston, File)
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