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.
Up to date temperature, ice and snow data with trends
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Expert commentary in regards to the record global temperature anomaly.