Digital Diatribes

A presentation of data on climate and other stuff

Temperature Trends for the last 120 months – HadCrut

Posted by The Diatribe Guy on May 16, 2012

Here are the latest charts for the HadCrut Global Temperature Anomalies, for the 10 year period ending March 2012.

The Data

What is presented here is the trend over the last 120 months, the slope of which has been in very consistent decline over the last decade. The current slope itself is -.083722, which represents a cooling rate of 0.1 degrees per decade. The negative slope of -0.086789 that occurred as of the ten year period ending February 2012 was the steepest negative trend line fitted since May 1969, if my spreadsheet and eyeballs are working correctly!

Chart below:

10 year Trend - HadCrut

Trend Line over Last 120 months – HadCrut

The next chart is simply a point of comparison. The highest slope value in recent years occurred with the 10-year period ending June 2002. The ten year slope does wobble, but not as much as the five year slope does.

Recent Peak trend line

Peak 120 Month Trend Line

Finally, I just wanted to graphically show what has transpired with the slopes over the last number of years with the ten year trend line. There has been a consistent decline in the best-fitted 10-year trend lines. The decline itself is a very close linear fit. There is little indication that this decline will halt in the near term. If I plug the latest 12-month average anomalies into each of the next 6 months, we see this trend line dipping below the -0.1 mark.

Trend in recent 120-month slopes

Trend in recent 120-month slopes

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