Last year tied 2007 as the sixth hottest on record since modern temperature records began in 1850, the World Meteorological Organization announced this week.The news follows January announcements by NASA and NOAA that ranked 2013 differently among the hottest years on record, but they all add up to one thing: Earth's long-term warming trend showed no signs of stopping last year.1) The global land and ocean surface temperature was 0.5°C (0.9°F) above the 1961-1990 average and 0.03°C (0.05°F) higher than the most recent 2001-2010 average, the WMO said. 2) Even more impressive: as the chart below shows, 2013 was the second-hottest year without an El Niño, the periodic warming of the equatorial Pacific that tends to warm up global temperatures (refer to picture above)
3) “The rate of warming is not uniform but the underlying trend is undeniable," said WMO Secretary-General Michel Jarraud. "Given the record amounts of greenhouse gases in our atmosphere, global temperatures will continue to rise for generations to come."
4) The 21st century so far has brought 13 of the 14 warmest years on record, the WMO said. The hottest years have been 2010 and 2005 – about 0.55°C (0.99°F) above the long-term average – followed by 1998, which had one of the 20th century's strongest El Niño events.
5) In contrast with 2012, when the U.S. experienced its warmest year on record, in 2013 the warmth was most extreme in Australia, which experienced its hottest year on record (and where every month in 2013 brought a national average temperature at least 0.5°C above average).
http://www.weather.com/news/science/environment/2013-6th-hottest-year-record-wmo-20140207
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