Rain totally kills my milage, but for purely social reasons. Living in the most densely populated area of the most densely populated state that happens to seemingly have the most dense (mentally) population: 3 raindrops = panic. Traffic slows down to the point where I do 25 on a 6 lane highway and that's before the accidents start piling up. Poor drainage means closed roads and lanes which increases congestion. People with their wipers going so fast they have no idea it stopped raining, people who drive excessively slow but still slam on their brakes at every opportunity, and people who swerve across lanes to avoid what might possibly have been a puddle but not really.
And then you throw in a slight breeze and possibly a slight chill in the air....
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