The "latent heat of evaporation" of gasoline is pretty impressive. I had read that the intake stacks of Indy cars would form coatings of frost, but it was seeing my brother's truck that brought it home.
350 CID Chevy, aftermarket intake manifold, 4-inch spacer under a 650 Holley.
Florida. Summer. >100 Fahrenheit.
100 yards from the beach.
Sitting there idling, engine temp 180F, hot air blasting back from the radiator and fan, frost formed on the carburetor spacer. You could put your hand on it and feel how cold it was.
Really high humidity can do some crazy things. You've seen aircraft contrails? You can also see them at the shooting range if it's muggy enough; subsonic bullets will leave a streak of fog behind them as they go downrange. Doesn't seem to happen with supersonic bullets for some reason. I would have expected it to be the other way around.
A friend had a Kawasaki ZX-10 Ninja. I was browing the service manual and noticed the British-spec Ninjas had spacers with electric heaters. There are places in America where those would have been handy.