November before cold / mild Winters in the USA (East)

von

Hello,

you subtract the surface sea level pressure of the Novembers before the 10 mildest Decembers (January / February months) from the Novembers before the 10 coldest Decembers (January / February months) since 1987. You get the areas of the greatest differences between the two groups, what you can see below are the charts leading to a cold month, just the opposite leads to a mild month in the east of the USA (defined as 30 – 50°N 95 – 65°W).

Novembers before a cold / mild December:

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Novembers before a cold / mild January:

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Novembers before a cold / mild February:

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Yours

KHB