Hi, one of the best spray jobs I have ever seen was done by a friend many years ago in mid Winter. He used anti bloom thinners and the finish was stunning after polishing.
I worry more about spraying on damp days as I have had problems with the damp air entering the compressor. Blooming and bubbles in the paint being the result.
Two years ago I was spraying on cold November days, good result but dry day.
I am only amateur and others may have different advice.
Sins my baby was born on tuesday it looks like the restor of my car is going to take a little longer and was thinking I might be able to do it in the autumn/winter as long as the weather is dry