Originally Posted by irish1958

That is what the "Stop the Rain" mod does.
When you have been in the bad weather for several days, you tab to desktop, install the mod, and resume the game with better weather. The game continues to change the weather on its schedule, so after a bit of time, you tab to desktop and deactivate the mod and the game gives you whatever the weather would be if you had played it for that period of time. The new weather will be random.
SH3Weather doesn't do a single thing to the weather after you have started the game. It merely changes it at the start.