disable the app and look out the window
,i have to say although the weather screen is nice with a sunny beach and lapping waves for my location, a full screen view is unnecessary
Don't think you can disable the animations in it, but you can snap it to the side of the screen, which makes it smaller.
When it's open on full screen, drag your mouse all the way to the left of the screen edge until the little preview window shows - right click - snap weather.