So I know a lot of people are gonna say that 60 F is too cold for a bird but here in NY we have a bunch of wild monks that are out even when it is in the 40's.
So how cold do you think is actually too cold for a bird?
Understanding that the vast majority of our Parrots are from areas with a higher normal temperature range than the Wild birds that stay the Winter. Also, there are a large number of Wild Birds that migrate too warmer climates in the Winters, cause its warmer elsewhere!
The Parrots that live with us 'in our homes' are accustom to a fairly narrow temperature range. So, taking them outside in 40 degree weather will be very cold for them. Can they become accustom to lower temperature ranges, yes! But, that requires them becoming adapted to that temperature with enough time to increase the downy layer of feathers. That transition would have to have begun months ago! So, please do not take your 'indoor' Parrot outside when its Cold!