Courtesy of NOAA
According to NOAA NCDC scientists, the average temperature for the contiguous U.S. during October was 53.9°F, 0.3°F below the long-term average. This ends a 16-month streak of above-average temperatures for the Lower 48 that began in June 2011.
On May 9, the daily mean concentration of carbon dioxide in the atmosphere of Mauna Loa, Hawaii, surpassed 400 parts per million for the first time since measurements began in 1958. It marks an important milestone because Mauna Loa, as the oldest continuous carbon dioxide (CO2) measurement station in the world, is the primary global benchmark site for monitoring the increase of this potent heat-trapping gas.
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According to NOAA scientists, April 2013 was also the 37th consecutive April and 338th consecutive month (more than 28 years) with a global temperature above the 20th-century average.
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