According to the National Oceanic and Atmospheric Administration (NOAA), the period from January through June was "the warmest first half of any year on record for the contiguous United States."
The average temperature was 52.9 degrees Fahrenheit, or 4.5 degrees above average, the NOAA said on Monday. Twenty-eight states east of the Rockies set temperature records for the six-month period. The 12 months ending on June 30 was the warmest 12-month period of any 12 months on record, according to the NOAA.
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