I know this is a dream request but I’ll suggest it anyway.
I have two weather sources I use regularly,WeatherBug and WeatherUnderground, to compare forecasts. Most of the time the temperature is close so I like to see how each forecasts rain and clouds each day.
It would be nice to see that comparison in one screen. I particularly like WB Sky Cover so I’d want that too so it would probably be the houly forecasts. Sometimes it’s fun to see who is closest at the end of the day.