[Vision2020] more global temperature data charts

[Paul Rumelhart]

I finally found time to get back to playing around with the global 
temperature data from the NOAA. 

Here are two charts, one showing min, mean, and max values for global 
temperature for 1980 through 2009, compiled by year, using the adjusted 
dataset.  The second is the same as the first, except that it covers the 
period 1851 through 2009.

Some interesting anomalies: There is a severe spike in minimum 
temperatures in the early 90's.  The chart for the full number of years 
show a gradual expansion of min and max values around the mean until 
about 1890 or so.  My first assumption is that the steady increase in 
the numbers of sites taking measurements would be the reason for this.  
In the temperature range shown in the graph, the mean line looks really 
flat, except for the occasional change, such as the large drop around 
2006.  The maximum values do appear to be steadily rising.

I've also included the spreadsheet from which I made the charts.

Paul
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