It can be normal, especially if the car was run for a short time the last time it was started.
A quick search of the forum shows plenty of results. Here are a few typical threads:
http://986forum.com/forums/performance-technical-chat/37116-smoke-start-up-help.html
http://986forum.com/forums/performance-technical-chat/54970-puff-blue-smoke.html
..and for your outside air temp thread, search "OBC hack".