See previous post, this may help.

I have produced an analysis of Central England
Temperatures (CET) for each month & season since 1971 with its
Standard Deviation from Mean over the same period, see link
http://i393.photobucket.com/albums/p...dDeviation.jpg

Each month & season is colour coded as follows.


= 3 Standard Deviation from Mean = Purple
= 2 Standard Deviation from Mean = Blue
= 1 Standard Deviation from Mean = Green
within 1 Standard Deviation from Mean = White



= 1 Standard Deviation from Mean = Yellow
= 2 Standard Deviation from Mean = Beige
= 3 Standard Deviation from Mean = Red


For more information about Standard Deviation, see
http://en.wikipedia.org/wiki/Standard_deviation