Wow! Im in central OC. It was pretty cold, but i didn't see any sighs of ice.

Don't worry about the citrus trees. Would have to take many hours of much lower temps to outright kill them. I have several citrus( Eureka Lemon, Meyer Lemon, Bearrs Lime, Valencia and Washington Oranges) growing in my yard here in Sacramento where we go down to 32 or a bit lower periodically each winter and the trees and fruit are fine. The fruits usually start to get damaged at several hours under 27 or 28 , but it would take quite a few hours down in the teens to kill the tree. If you're talking about a small young newly planted tree then that would be more sensitive of course.