Problem with weather changing in the middle of a turn

[Arkan]

We are currently playing this campaign scenario with Akilpio ( 0623_02: The Battle for Byelorussia - [HTH]_Alt, loadable on the blitz, made by sgtFury) and we ran into a problem. We checked the “programmed weather” option, but despite that, the weather changed from soft to normal in the middle of the day. Akilpio was able to play his turn with normal weather, and when I received the file I also started with normal weather. After saving the game, I quit. When I came back later to the game to finish my turn, the weather had changed back to soft. 

Does anyone have an idea how we could fix this problem?