In areas where it often gets over 85F during the day, air temp, its better to bring your dragon out in the morning or a few hour before sundown...when its cooler and still sun out to benefit your dragons.
Solid sided containers can heat up fast when its hot outside, so screen or clear sided containers (not glass!) with good shaded areas or placed mostly in shade, are better to use.
Dragons who haven't been out much or never outside before, can freak out easily as they are not used to having all kinds of things above them (other than a bright light and the ceiling of their cage. Not to mention all the other things moving about outside (trees, people, cars, animals etc) so its quite a shock to them. Its best to bring them out somewhere with as little activity as possible to get them used to it...but they typically calm down after a few sessions outside.
ALso make sure they are well secure in their outdoor cages as you don't want one to get away from you in a panic...
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PHLdyPayne