I keep my gliders outside all year round and we do have some stray cats that hang around but the gliders mainly stay on the top of the cages. You could double wire an enclosure for safety and perhaps put you gliders out when the weather is ok, they would love it.
Thats the aviaries behind the tree in the middle of my backyard. We had snow last winter and an extremely hot summer and I only brought them inside on a few of the hot days when it was over 100degrees but they always spent the night outside. Our temperatures vary from 35 degrees any where up to 113 degrees. We do do things to cool down the aviaries like add frozen peas in there beds or water down the cages and make sure they have shade over there cages in the heat of the day. Then in winter I always make sure they have plenty of fleece in their nest boxes