Chalk this up to perhaps "why did they think of that?" but a new concept phone gives you a pretty convincing display of what the weather will be.
According to the blog DesignCrave.com, "The Window Phone designed by Seunghan Song provides a sleek glass interface that changes to reflect the weather conditions outside."
The phone's face, which is transparent, changes to a look of rain or fog or clear, depending on what it's doing outside.
I think this device has already been invented. It's called a window :) Actually, I'd say if you have any cell phone with weather capability, you can achieve a similar effect:
The Window Phone is just a concept, just like those cool cars we always see with flat wheel wells and bubble frames, but I have to admit while the practical side is probably not all that incredible, I do give them very high marks for the graphic design :)