I've driven Laguna Seca a few time in late Dec. Track temps to start the day were in the mid 30's and some sections (like the corkscrew) don't get direct sunlight all day long. Yeah you don't the tires up to temp and the grip isn't as good. But still lots of fun.
Drove a track once in the wet (morning only) agree it's something we should all get the hang of. But in the end with the lack grip it wasn't all that fun. Suppose it didn't' help that it was a track with tons of wall close by to hit (Sears Point).