Thank you for your information . Right now I have Leghorns. They are very sweet natured but can fly to the top of our pen. They would like to get in to the trees but we try to prevent that. I like the looks on the Wyandottes and will read up on them. They look like they would be to heavy to fly. You sound like someone that knows thier birds well. Thank you again for your help.
Yep, Leghorns are fliers. I agree with HouseCat, stay away from Mediterranean breeds. That's White Faced Black Spanish, Leghorns, Minorcas, Ancona, Sicilian Buttercups, Andalusians, and Catalanas. They all have a similar "shape" (Italian breeds are slightly smaller than Spanish breeds though) and white earlobes. They're definitely good fliers. I've found that Lakenvelders, d'Uccles (one of my pullets flies from wherever she happens to be in the yard to land on my head when she sees me <3)(, and Sumatra are flighty too.
Breeds that don't fly as much are heavier breeds. Plymouth Rocks, Orpington, Cochin, Faverolles (mine like to fly/hop across the ground though, it's really cute) EEs, Wyandottes, Cornish, Rhode Island Red, Brahmas, Sussex, and Naked Necks are some examples.
And to your original question: Chickens really don't mind the rain. I've even had to run out and grab some that were standing around in the hail. I've had a mama sit outside in the rain all day and night to keep her chicks dry. She was soaked but she wasn't going to move and risk letting them get chilled. (I eventually moved her inside because it was about to hail and I didn't want her getting hurt.)
Hope this helps
~~Ms.B
(Also, I apologize for any misspellings. Auto correct has a hard time understanding the spelling of chicken breed names)