Riddle #159

A man lives on the 12th floor of an apartment building. Every morning he takes the elevator all the way down to the ground floor. Every evening, he rides the elevator back up to only the 7th floor and walks the rest of the way — except on rainy days, when he rides it all the way to the 12th floor. Why?

You solved this one before

Open-ended riddle: think it through, then reveal the answer.