Yes, another curious thread. I have noticed on certain EaW/FoC maps that at certain times, it is day time, and sometimes it is night, and there is an occasional variation in the environment, such as rain never happening, and at other times rain being constant or random. How does this work, and is this something the map editor does, or is it scripted?
Its in the maps. Under WEATHER tab, you can click ADD and you will have a new weather setting.
When the game loads the map, one weather setting is chosen.