Reply #1: They hide under stuff if it gets too rainy

[AlienGirl]

Many birds use rain showers as a chance to get wet and preen their feathers. If the weather is bad enough, or the birds don't want to get wet, they hide under things--roof overhangs on houses, on a branch under a larger branch, or near the center of a conifer tree where there is some shelter from weather are all common places. (Butterflies, incidentally, land on the underside of a leaf, fold up their wings, and wait it out.)

Cold-climate birds are really well-insulated against the cold, so they usually don't have a problem with low temperatures. If it gets *too* cold they huddle together and share body heat.

Tucker