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'Coolest' Month in 2010 Ties Second Warmest October

Global Temperature Report: October 2010

Global climate trend since 1978: +0.14 C per decade

October temperatures (preliminary)
Global composite temp.: +0.42 C (about 0.76 degrees Fahrenheit) above 20-year average for October.

Northern Hemisphere: +0.37 C (about 0.67 degrees Fahrenheit) above 20-year average for October.

Southern Hemisphere: +0.47 C (about 0.85 degrees Fahrenheit) above 20-year average for October.

Tropics: +0.15 C (about 0.27 degrees Fahrenheit) above 20-year average for October.

September temperatures (revised):
Global Composite: +0.60 C above 20-year average
Northern Hemisphere: +0.56 C above 20-year average
Southern Hemisphere: +0.65 C above 20-year average
Tropics: +0.29 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 Nov. 2, 2010:
How warm has 2010 been? So warm that although October was the coolest month so far this year year (compared to seasonal norms), it tied October 2006 as the second warmest October in the 32-year satellite climate record, according to Dr. John Christy, professor of atmospheric science and director of the Earth System Science Center at The University of Alabama in Huntsville.
Warmest Octobers*
Year Globe NH SH Trpcs
2005 0.47 0.48 0.45 0.15
2006 0.42 0.38 0.47 0.33
2010* 0.42 0.37 0.47 0.15
1998 0.41 0.51 0.31 0.34
2003 0.41 0.55 0.27 0.3
2004 0.36 0.33 0.38 0.19
2009 0.36 0.33 0.39 0.39
2001 0.3 0.25 0.36 0.21
2007 0.26 0.31 0.22 -0.11
2002 0.25 0 0.49 0.2
*Compared to seasonal norms.
2010 remains the second hottest year in the record, with average daily temperatures through October that were only 0.03 C -- a difference that is not statistically significant -- cooler than the record set in 1998 during

an El Nino Pacific Ocean warming event.

As part of an ongoing joint project between UAHuntsville, NOAA and NASA, Christy and Dr. Roy Spencer, a principal research scientist in the ESSC, use data gathered by advanced microwave sounding units on NOAA and NASA

satellites to get accurate temperature readings for almost all regions of the Earth. This includes remote desert, ocean and rain forest areas where reliable climate data are not otherwise available.

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.

Dr. John Christy, (256) 961-7763
Dr. Roy Spencer, (256) 961-7960

Dr. Roy Spencer | Newswise Science News
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