On Dec 8, 3:19*pm, Teignmouth wrote:

I've calculated the December mean from 1971 - 2009 as +5.0c, with a
Standard Deviation of 1.5c, so by my calculations the current CET that
is running at -2.0c is somewhere between 4 & 5 Standard Deviations.

Is there evidence that these values are normally distributed? Maybe
this has been throughly tested and is well-known? But if not then
personally I'd be happier with a non-parametric analysis.

JGD