Don't Take Pictures in Japan in Summer

My nifty little HP927 has a handy feature on it that gives you advice about the picture you just took-- if it was out of focus, or if you should try shutter priority or aperture priority or the like. Because of it, I learned something new-- that CCDs are fairly temperature-sensitive, and if you take pictures too far outside their ideal operating temperature, you'll get poor (usually grainy) results. Unfortunately, that temperature range apparently does not include "Japan in the summer", because about 80% of the outdoor pictures I took there caused that warning to pop up. It's a bit frustrating, because there's only so much I could do to cool things off, and pouring cold water over it (my personal favourite method of cooling down) was probably a warranty violation of some sort.