All regions.
The challenges would depend on the type of weather for the region.
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Because of bad weather in the area.
D-Day was postponed because of bad weather.
The D-day date changed because of bad weather.
Because the water can freeze in cold weather And cause brake failure.
I'll say the weather was classified in ww2, because they didnt want soldiers spreading rumors among other soldiers about the weather being in advantaged or disadvantaged towards them. Like Germany, Hilter sent all his soldiers to Russia, and they all froze to death. You need to long prepare and classify any useful weather information.