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
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.
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Still waiting for the satellite data, which is running behind for some reason. The NCDC data should be released within a day or two.
A new in-depth analysis of peer-reviewed summaries shows an overwhelming consensus among scientists that recent warming is mostly caused by human actions....
Remote Sensing Systems has just released their global satellite measured temperatures for the month of April.
A new, computer modeling study led by NASA shows for the first time how rising CO2 concentrations could affect the entire range of rainfall types for the globe.....
The Arctic sea ice extent declined at a fairly normal seasonal rate during the month of April, but the actual extent is still running slightly lower than what it was last year.....
Warming temperatures are found to cause an increase in concentrations of natural aerosols from plant emissions that have a slight cooling effect on the atmosphere.
The last long-term global cooling trend ended late in the 19th century.....
Climate Change
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