From: South Carolina, USA
I think there may be a misunderstanding of the card I proposed.
It is a card played by a nation to equip troops for winter warfare. It should have a significant cost, perhaps 150PP, and it would negate special effectiveness penalties due to winter in harsh winter areas. Like "Better Training" it would be paid once per game. It would apply to all following winters since no one at the time was capable of predicting when a specially harsh winter would come. Very many invasions of Russia in our games come well before 1941. I also propose that the Soviets get "winter preparedness" without paying the cost.
Let's say the British plan a campaign against the Italians in Spain. It is September so winter campaigning is expected. Because Spain does not have significantly hard winters neither Italy or Great Britain bother to spend the 150PP. They both have some degradation from winter effects bur "no harm, no foul".
Another touch would be to make the card more expensive the closer to winter it is purchased. March, April, May, and June = 150, July, August, September = 180, October, November = 300, December, January, February = 400. This reflects both actual production, but especially the cost of getting supplies to the front. Shipping winter supplies in mud months should be brutal.