By: Jeff Masters , 4:10 PM GMT on July 20, 2015
June 2015 was Earth's warmest June since global record keeping began in 1880, said NOAA's National Centers for Environmental Information (NCEI) on Monday. NASA also rated June 2015 as the warmest June on record. June 2015's warmth makes the year-to-date period (January - June) the warmest such period on record, according to both NOAA and NASA. A potent El Niño event in the Eastern Pacific that crossed the threshold into the "strong" category in early July continues to intensify, and strong El Niño events release a large amount of heat to the atmosphere, typically boosting global temperatures by at least 0.1°C. This extra bump in temperature, when combined with the long-term warming of the planet due to human-caused emissions of heat-trapping gases like carbon dioxide, makes it likely that 2015 will be Earth's second consecutive warmest year on record. Four of the six warmest months in recorded history (for departure from average) have occurred this year, according to NOAA:
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[click on the picture to see the continuing increase in temperature more recent years.]
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For the oceans, the June global sea surface temperature was 0.74°C (1.33°F) above the 20th century average, the highest for June on record, and tied with September 2014 as the highest monthly departure from average for any month. Nine of the ten highest monthly departures from average have occurred since May 2014. Global land temperatures during June 2015 were also the warmest on record.
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Arctic sea ice extent during June 2015 was the 3rd lowest in the 36-year satellite record, and June snow cover was the 2nd lowest
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