Global climate trend since Nov. 16, 1978: +0.14 C per decade
January temperatures (preliminary)
Global composite temp.: -0.01 C (about 0.02 degrees Fahrenheit) below 30-year average for January.
Northern Hemisphere: -0.06 C (about 0.11 degrees Fahrenheit) below 30-year average for January.
Southern Hemisphere: +0.04 C (about 0.07 degrees Fahrenheit) above 30-year average for January.
Tropics: -0.37 C (about 0.67 degrees Fahrenheit) below 30-year average for January.
December temperatures (revised):
Global Composite: +0.18 C above 30-year average
Northern Hemisphere: +0.22 C above 30-year average
Southern Hemisphere: +0.15 C above 30-year average
Tropics: -0.22 C below 30-year average
(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)
Notes on data released Feb. 3, 2011:
The La Nina Pacific Ocean cooling event continues to pull down temperatures, with the global average temperature falling below seasonal norms for the first time in 18 months and only the second time in almost two and a half years, according to Dr. John Christy, professor of atmospheric science and director of the Earth System Science Center at The University of Alabama in Huntsville.Technical Note:
The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about eight kilometers above sea level. Once the monthly temperature data is collected and processed, it is placed in a "public" computer file for immediate access by atmospheric scientists in the U.S. and abroad.
Neither Christy nor Spencer receives any research support or funding from oil, coal or industrial companies or organizations, or from any private or special interest groups. All of their climate research funding comes from federal and state grants or contracts.
For Additional Information:Dr. John Christy, (256) 961-7763
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