I don't smoke in cars anymore, so I pretty much never open the windows when it's raining. I do like to open them when the weather is nice (e.g., TODAY!) but I get such a blast of wind on the left side of my face that it's just not worth it. Oh, and it's too loud with them open, too.
Anyhoo... I'll buy a set on all of these strong recommendations and see if they help.