Fellow Floridians, So I am pretty new to back yard chickens.... like 3-4 weeks new

So, my question is about rain. We had our first big day time thunderstorm yesterday with the chicks outside in the coop/run. They are about 5 weeks old now we estimate. They were in the run area, but looked pretty dry still b/c of the way the roof is built, it seemed all the water was being directed away well.
But I was concerned about the little Silkie since I read they are more susceptible to being cold b/c of their feather type. Anyhow, I put all 3 of them up in the coop where they would be very dry. They really didn't want to go, then they all turned around and made their way back down the ramp into the run area again. They stayed in the run until dark. I guess my question is: do most chickens want to be in the coop during the rain? Is it not a big deal where they are?
I had to "train" them to use the ramp, so I am not sure if I have to show them to get out of the rain too. Or if its not a big deal at all? Thanks for the input