WMO: The Global Climate in 2011–2015

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World Meteorological Organization: THE WORLD’S WARMEST FIVE-YEAR PERIOD ON RECORD

The period 2011–2015 was the warmest five-year period on record globally. Using the mean of three major global datasets, temperatures for the period were 0.57 °C (1.03 °F) above the average for the standard 1961–1990 reference period.
This compares with the period 2006–2010, in which temperatures were 0.51 °C (0.92 °F) above average, and is consistent with a continued sustained warming trend that  has been apparent in global data since the mid-1970s. 

The warmest year on record to date was 2015, during which temperatures were 0.76 °C (1.37 °F) above the 1961–1990 average. The year 2015 was also the first year in which global temperatures were more than 1 °C above the pre-industrial average.7 The second-warmest year was 2014, which was 0.61 °C (1.10 °F) above the 1961–1990 average, while 2013 ranks as the equal-fifth warmest year. Substantially influenced by La Niña events (especially the former), 2011 and 2012 were somewhat less warm but still warmer than any year prior to 1998, and warmer than any previous La Niña year. The world’s 12 warmest years have all occurred since 1998, 9 of them since 2005. 

While the high temperatures in 2015 were influenced by the El Niño event that developed during that year, the impact of El Niño on global temperatures is typically stronger in the second year of the event than in the first. 

The Global Climate in 2011–2015

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