Portia,
We got a good soaking this morning and all of our chickens (all 10-12 weeks) huddled together under a table. Like yours, they have noever experienced rain. We had a good storm 2 days back but I left them in their coop. When the boys tried to put a piece of wood to shield the rain, everyone took off running into the rain and huddled together against the fence. We got all but one stubborn bantam white leghorn, named trixter, into the coop and all worked out. I stood in the rain, and fashiioned a canopy over their door from a tarp and fence posts. Hopefully this will afford them a better option next time it rains, as I hope it willstart doing a lot soon. I'm very sorry for your loss and pray for your remaining babies.
Beth