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There are no surprises here.What has changed is solar output. Sunspot activity is at a low point "eerily calm" according to scientists.
This is undoubtedly the cause of the recent cold spell and further conclusions may be reached from this.
Solar irradiance has a known impact on temperature.
We are presently at the weakest point of the solar (11 year) cycle, viz:
http://www.sciencedaily.com/releases/2008/05/080512120523.htm
I the climate models and hemispheric variations run true, the northern hemisphere's weather is likely to run to greater extremes.
The reason there has been a name shift from AGW to CC is largely due to the fact that anomalies can give an appearance that "warming" has disappeared. The warming trend is global and decadal.
One cold winter does not mean there will also be a cool summer. In the northern hemisphere the temperature ranges should increase.