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 October, 2012.
Global climate trend since Nov. 16, 1978: +0.14 C per decade
October temperatures (preliminary)
Global composite temp.: +0.33 C (about 0.59 degrees Fahrenheit) above 30-year average for October.
Northern Hemisphere: +0.30 C (about 0.54 degrees Fahrenheit) above 30-year average for October.
Southern Hemisphere: +0.36 C (about 0.65 degrees Fahrenheit) above 30-year average for October.
Tropics: +0.11 C (about 0.20 degrees Fahrenheit) above 30-year average for October.
Notes on data released Nov. 6, 2012:
The pause in the anticipated El Niño Pacific Ocean warming event — seen in the sea surface temperatures in the Pacific during the past two months — is now appearing in the tropical upper air, according to Dr. John Christy, a professor of atmospheric science and director of the Earth System Science Center at The University of Alabama in Huntsville. The absent El Niño shows up in the relative temperatures of the world's parts: While October 2012 was the second warmest October in the satellite record for the Southern Hemisphere and fourth warmest for the north, the tropics were scarcely warmer than normal for the month — only the 13th "warmest" October in the 34-year satellite record.
Compared to seasonal norms, the coldest area on the globe in October was south central Saskatchewan to the east of Saskatoon, which was 2.28 C (about 4.1 Fahrenheit) cooler than normal for the month. The warmest area was in the central Bering Sea, where temperatures averaged 3.95 C (about 7.1 degrees Fahrenheit) warmer than seasonal norms for October.
Go here to see the monthly satellite data from 1978 to the present.