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 May 2013:
Global Temperature Report: May 2013
Global climate trend since Nov. 16, 1978: +0.14 C per decade
May temperatures (preliminary)
Global composite temp.: +0.07 C (about 0.13 degrees Fahrenheit) above 30-year average for May.
Northern Hemisphere: +0.16 C (about 0.29 degrees Fahrenheit) above 30-year average for May.
Southern Hemisphere: -0.01 C (about 0.02 degrees Fahrenheit) below 30-year average for May.
Tropics: +0.11 C (about 0.20 degrees Fahrenheit) above 30-year average for May.
(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)
Notes on data released June 4, 2013:
Global average temperatures and the tropics continued a slow cooling drift in May, downward from a warm January, said Dr. John Christy, a professor of atmospheric science and director of the Earth System Science Center (ESSC) at The University of Alabama in Huntsville.
Compared to seasonal norms, during May the coldest area on the globe was in northern Greenland, where the average temperature was as much as 3.75 C (about 6.7 degrees Fahrenheit) cooler than seasonal norms. Compared to seasonal norms, the "warmest" area on the globe in May was in the northern Siberia. Temperatures there were as much as 3.91 C (about 7.0 degrees Fahrenheit) warmer than seasonal norms for May.
Go here to see the monthly satellite data since 1978.