I've been playing off and on for over 30 years. I've done musicals and played in local groups when I can. I mostly play in church these days.
I had an experience recently that got me thinking if I am right, or just not experienced. I was playing a Purcell Voluntary with the organ at church a while ago and it was a pretty cold day. The area where the organ is has a padded table for the handbells which I laid my horn on during the service. The before service practice was great, but the song wasn't until the near the end of the service, so the horn got pretty cold sitting on the table. I didn't have much of a chance to warm it up, so I played it as it was. I found that on the high notes I had a hard time locking in the pitch. The horn is a Bach Strad Model 37 which I've played for about 2 years. It is definitely a lot more flexible in the pitch than my other intermediate horns I've owned. So is a cold horn a lot harder to stay on pitch and not wobble to the other slots, or was it just that I don't practice enough?