Worms in the Rain

It's April, so it's been raining a lot lately. I've noticed this many times that after a rainstorm, you see worms all over the payment. I always wonder if the worms knew they were going to die. Why don't they stay closer to the ground so they can go back down after the rain stops? Sometimes after the rain, if I see that a worm is still alive and writhing on the payment, I'll pick up a stick and place them on a patch of grass. I don't know if they survive. I guess it's just to make myself feel better.