Global Temperature Trend Update: July 2011
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 July, 2011.
July 2011 was 3rd warmest July in 33-year temperature record
Global Temperature Report: July 2011
Global climate trend since Nov. 16, 1978: +0.14 C per decade
July temperatures (preliminary)
Global composite temp.: +0.37 C (about 0.67 degrees Fahrenheit) above 30-year average for July.
Northern Hemisphere: +0.34 C (about 0.61 degrees Fahrenheit) above 30-year average for July.
Southern Hemisphere: +0.40 C (about 0.72 degrees Fahrenheit) above 30-year average for July.
Tropics: +0.20 C (about 0.36 degrees Fahrenheit) above 30-year average for July.
June temperatures (revised):
Global Composite: +0.32 C above 30-year average
Northern Hemisphere: +0.38 C above 30-year average
Southern Hemisphere: +0.25 C above 30-year average
Tropics: +0.23 C above 30-year average
(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)
Notes on data released August 1, 2011:
July 2011 was the third warmest July in the 33-year satellite-based global temperature record, which is consistent with the long-term warming trend seen in the satellite data, 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.
A few regions with warmer than normal temperatures were scattered across the North Hemisphere, including the eastern two-thirds of North America. July's two "warmest" anomalies were in West Antarctic, more or less due south of … Marin County, California. Winter Antarctic temperatures were as much as 5.57 C (about 10.03 degrees F) warmer than seasonal norms there.
July Averaged Global
Temperature Anomalies
July 1979-2011
Warmest to Coolest
(degrees Celsius)
1. 1998 +0.441
2. 2010 +0.419
*3. 2011 +0.372
4. 2009 +0.359
5. 2005 +0.272
6. 2002 +0.219
7. 2007 +0.181
8. 2006 +0.147
9. 1991 +0.118
10. 1988 +0.117
11. 2003 +0.109
12. 2001 +0.061
13. 1983 +0.048
14. 1987 +0.044
15. 1995 +0.025
16. 1997 +0.015
17. 1980 -0.002
18. 2008 -0.009
19. 1990 -0.028
20. 1981 -0.031
21. 1994 -0.032
22. 1999 -0.075
23. 1996 -0.086
24. 2000 -0.087
25, 1993 -0.115
26. 1979 -0.122
27. 1989 -0.172
28. 2004 -0.189
29. 1986 -0.259
30. 1982 -0.328
31. 1984 -0.336
32. 1992 -0.405
33. 1985 -0.447
Go here to take a look at the monthly data since 1978.