It's finally spring here in Canada and the snow is all gone, what I'm wondering is how warm does it have to be to start letting a little sully outdoors again? He gone from 450g to almost 2 pounds over winter and he's ready to be out in the backyard again. What temps should it be reaching during the day for it to be safe to put him outside? I've attached a photo of him enjoying a treat of collards to get an idea of his size. He's about 1.5 years now.