The average temperature for the contiguous U.S. during June was 71.2°F, 2.0°F above the 20th century average, ranking 14th warmest June on record. Scorching temperatures during the second half of the month broke or tied over 170 all-time high temperature records in cities across America. June temperatures also contributed to a record-warm first half of the year and the warmest 12-month period the nation has experienced since recordkeeping began in 1895.
(from NOAA News Releases http://www.ncdc.noaa.gov/sotc/national/2012/6)
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