This is model related.. trust me...
As others have hinted , this model output is similar to Jan 1947... As much as I love snow and cold, the following makes sober reading.
"The winter is also cited as a factor in the devaluation of the pound from $4.03 to $2.80, Britain's decline from superpower status and the introduction of the Marshall Plan to aid war-torn Europe."
You can google it , but here is the link. (There are models in there)
http://en.wikipedia.org/wiki/Winter_of_1946%E2%80%931947_in_the_United_Kingdom
Mods, feel free to move this to ramp/moaning if need be.