40 is quite cool for the birds. Birds can survive more extreme temperatures than people give them credit for but I personally don't like mine to get below 60-65 F. Usually our heat or cooling is set right around 68-72 but this is not a "must" for anyone. If there are no predators (even hawks and many other large birds can be predators) etc then I imagine it would be safe as long as your cage is really secure and as long as you watch out for temperature extremes, the same would go if it got too hot in the summer. Not sure how hot it gets in your area of CA since I am in the cold midwest but just use good sense. If it seems too cool for you it is probably too cool for your birds and if it seems too hot for you again it is probably too hot for them. If your birds have been very used to set temperatures and always being indoors I would try to acclimate them slowly to make sure it does not cause too much stress to them.

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