According to NOAA (National Oceanic and Atmospheric Administration of the U.S. Department of Commerce):
Persistent heat on land and in the sea this June shattered records, yet again.
June 2016 was 1.62 degrees F above the 20th century average, breaking last year’s record for the warmest June on record by 0.04 degrees F, according to scientists from NOAA’s National Centers for Environmental Information. NOAA’s global temperature records dates back 137 years to 1880.
For the year to date, the average global temperature was 1.89 degrees F above the 20th century average. This was the highest temperature for this period, surpassing the previous record set in 2015 by 0.36 degrees F.
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