Every month University of Alabama in Huntsville climatologists John Christy and Roy Spencer report the latest global temperature trends from satellite data. Below are the newest data updated through June, 2010.
The accompanying UAH press release notes:
First six months of 2010—second warmest on record
Global climate trend since Nov. 16, 1978: +0.14 C per decade
June temperatures (preliminary)
Global composite temp.: +0.44 C (about 0.79 degrees Fahrenheit) above 20-year average for June.
Northern Hemisphere: +0.55 C (about 0.99 degrees Fahrenheit) above 20-year average for June.
Southern Hemisphere: +0.32 C (about 0.58 degrees Fahrenheit) above 20-year average for June.
Tropics: +0.48 C (about 0.86 degrees Fahrenheit) above 20-year average for June.
May temperatures (revised):
Global Composite: +0.53 C above 20-year average
Northern Hemisphere: +0.78 C above 20-year average
Southern Hemisphere: +0.29 C above 20-year average
Tropics: +0.71 C above 20-year average
(All temperature anomalies are based on a 20-year average (1979-1998) for the month reported.)
Notes on data released July 7, 2010:
Global average temperatures through the first six months of 2010 continue to not set records, according to Dr. John Christy, professor of atmosphericscience and director of the Earth System Science Center at The University of Alabama in Huntsville. June 2010 was the second warmest June in the 32-year satellite temperature record and the first six months of 2010 were also the second warmest on record.
Compared to seasonal norms, temperatures in the tropics and the Northern Hemisphere continued to fall from May through June as the El Nino Pacific Ocean warming event fades and indications of a La Nina Pacific Ocean cooling event increase.
The warmest Junes on record were June 1998 at 0.56 C warmer than seasonal norms, June 2010 at +0.44 and June 2002 at +0.36.
Go here for the satellite data used to derive the global temperature trend graph above.