I honestly cant think of any time or reason I would want to use it outside...so its not a concern for me.
You a vampire or something?
You ever read a book at the beach/pool/deck? I enjoy sitting on balcony, watching my game on tv, surfing on the web, all while enjoying my great skyline views on a warm spring/summer afternoon....luckily, as long as there is a good breeze, the thing seems to stay cool enough so far....watch out for that black background on kindle in the sunlight!
If I'm going outdoors I see no need for a computer....if I need to check my email I have a phone.