Overall HadCrut trends as of March month-end 2012

Digital Diatribes

Time for an update on the HadCrut data set.

I plan on submitting separate posts over the next few days taking a look at the different time horizons on the charts.

Today’s submission is just the overall total trend, and the current longest period length of time backwards from current that demonstrates a flat or cooling trend in the data.

The Data
As can be expected, the overall chart from inception does not change much over the course of a year, but it is presented for completeness. However, I’ll speak to a few of the numbers as they’ve transpired since my last series of posts last year.

From December 2010 through December 2011 we had 13 consecutive months where the anomaly was lower than the previous year. As such, the trend lines have predictably declined in magnitude over that period of time. The January anomaly of 21.7 was slightly above…

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