Some friends and I were just talking about drive-in movies (we don't have them here in the UK) and we ended up a bit baffled.

Are they "year round" events or very seasonal?? We figured that in the summer, it would be too light to show pictures outdoors (unless the movies start very late) whereas in the winter it would be much too cold for people to spend two hours sitting in a stationary car. Either way, we couldn't imagine them being very popular.

And how does the sound get to your car? Presumably they don't have massive loudspeakers because that would annoy any nearby residents - so do they broadcast the sound to your car radio or something?