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Hey Doug,
While you did switch plugs you stated you were running Bosch F2CS. The NGK heat range 9 is the same as Bosch 2's. So unfortunetly you stayed at the same range.
Let me re-word this about ambient. Although the ambient air outside changes to what ever the temperature it is currently, it is in fact the temperature of the plug that is what's important as Mark stated. But the outside ambient WILL have an effect on the duration a given motor will reach it's operating temperature. So if your plugs are too cold to begin with and the ambiemt temp drops dramatically it will effect the engines overall operating temperature and affect the plugs as well. Once you reach the optimum plug heat range the ambient temp would be less of a factor. If it is fouling that fast then I would try a heat range of 7 now and as long as it stays clean watch it carefully when summer comes and inspect them to see how the combustion is with those plugs and go from there.
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It changes from time to time.....
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