February 2009 Update on Global Temperature – GISS
Posted by The Diatribe Guy on February 25, 2009
I didn’t look at GISS last month, so here’s a quick update for the January month-end numbers:
The overall trend since January 1880 has a slope of 0.047, which corresponds to warming of 0.564 degrees Celsius per Century.
The furthest back we can go to see a flat or cooling trend is January 2001, 8 years and a month.
- The anomaly for January was 52, which was actually not as large a jump as the satellite data showed.
- The historical rank of that anomaly, though, still shows it to be the 5th warmest January on record and the 62nd highest anomaly out of 1,549.
- This is the fifth consecutive year-over year warmer anomaly
The rest of the charts show the various slope change charts, which shows how the various slopes have changed since the last peak.
The 60-month slope values have trended down since early 2004, with some cyclical fluctuations on the way. The current slope value of -0.1147 represents 1.37 degrees cooling per century. After a small bounce, this latest value reversed a bit.
The 120-month slope values have trended down overall since early 2002. The current slope value of +0.1535 represents 1.84 degrees warming per century. This is a slight decrease from previous, but in the range where it's been holding for a few months. It is anticipated that this will decline later this year as some low front-end anomalies fall off.
The 180-month slope values have trended down since 2007. The current slope value of +0.1489 represents 1.79 degrees warming per century. This has declined continuosly in that time and is at its lowest value since the period ending December 2002.
The 240-month slope values have generally trended down overall since early 2004. The current slope value of +0.1554 represents 1.86 degrees warming per century. The most recent slope vlaues have dropped quickly after a period of level slopes for over a year.
The 300-month slope values have trended down overall since early 2007, though the trend over the last year or so is actually positive. The current slope value of +0.1579 represents 1.89 degrees warming per century. Other than a dip in mid-2008, the slope level has hoverred around the 0.158 mark since October 2007.
The 360-month slope values have trended down overall since 2005. The current slope value of +0.1339 represents 1.61 degrees warming per century. This has declined steadily for over a year and is now at the lowest value since the period ending September 2002.