Every month University of Alabama in Huntsville climatologists John Christy and Roy Spencer publish the latest global temperature trend data obtained from NOAA satellites. For the month of August 2015 they report:
Global Temperature Report: August 2015
In the tropics, warmest August in the satellite temperature record
Global climate trend since Nov. 16, 1978: +0.11 C per decade
August temperatures (preliminary)
Global composite temp.: +0.28 C (about 0.50 degrees Fahrenheit) above 30-year average for August.
Northern Hemisphere: +0.25 C (about 0.45 degrees Fahrenheit) above 30-year average for August.
Southern Hemisphere: +0.31 C (about 0.56 degrees Fahrenheit) above 30-year average for August.
Notes on data released Sept. 8, 2015:
Driven by a growing El Niño Pacific Ocean warming event, temperatures around the globe continued to rise through August, setting a new August record in the tropics for the satellite record, said Dr. John Christy, director of the Earth System Science Center at The University of Alabama in Huntsville. Temperatures in the tropics averaged 0.52 C (about 0.94° F) warmer than seasonal norms in August, surpassing the previous record of +0.46 C set in August 1998.
Globally it was the third warmest August in the satellite record, trailing only August 1998 and 2010. It was also the third warmest August in the Southern Hemisphere, behind August 1998 and August 2002.
Compared to global temperature anomalies from all months, August 2015 tied as the 32nd warmest month since the satellite record began in December 1978. It was tied with five other months, all since October 2005. In the tropics, August 2015 tied with September 2009 as the 17th warmest month, when compared to seasonal norms for all months.
Go here to see the monthly data for temperature trends.