i think i figured it out, but it's not something i did, it's in your demo as well.:/ if you let it run for a couple hours, the screen tone will have completely turned black or completely white. according to my observations, my guess would be that if new weather follows directly, instead of fading out and returning to 0 weather, the tint is added/substracted again without resetting the screen to the original tone first.
it's hard to believe no one noticed this before, especially after being out there so long...could you please check this?