The summer of 2012 was tied for the 2nd warmest on record in the northern Hemisphere, according to the Goddard Institute for Space Studies (GISS). The warmest on record occurred in 2010.
June/July/August 2012 temperature anomalies courtesy of GISS.
The northern Hemisphere summer, which covers the months of June, July and August, ended up averaging +0.74 degrees C. above the 1951-1980 average. Records go back to 1880.
For the month of August, the northern Hemisphere averaged 0.65 degrees C. above normal, putting the month tied for 5th warmest.
Globally, August 2012 was tied for 6th warmest on record, averaging 0.56 degrees C. above normal.
August 2012 temperature anomalies, courtesy of GISS.
For the months of June, July and August 2012 combined (summer north/winter south) the period averaged 0.53 degrees C. above normal, which makes it tied for 7th warmest.
Still waiting for the satellite data, which is running behind for some reason. The NCDC data should be released within a day or two.
As the planet warms there may be less impact on drought than previous studies have shown.
Climate model projections can become quite uncertain at more localized levels.
Arctic sea ice melt season trend this year.
Last month was the warmest of any month on record globally going back to the late 19th century.
Why hasn't global sea level rise accelerated over the past 20+ years?
Researchers recently compiled a new historical record of sea ice extent in the Arctic going back to the mid-19th century.