Yesterday I saw bees on the front of my hive (located near wooded area in front yard) in the rain. They were on the entrance board also. Why were they out in the rain? We had low temps here too. Doesn't make sense to me.
They were likely warm enough to fly, but wouldn't because of the rain. They will also use water to rehydrate honey before feeding it to the larva or eating it. They will take a certain amount of water at all times.