Okay, I know you guys are going to hate this, but...
I live in the Tampa Bay area, where we've had a very warm winter - temps predominately in the 70s. However, two weeks ago this coming Saturday, I drove over to Sebring to volunteer - help out in corner 8 at the 48 hours of Sebring Porsche races. It was about a 2 hour drive over from my home in Palmetto, had to leave at 5:30 am to get to Sebring by 7 am (obviously at speed around 80 to 90) with the top down. This particular morning, it was about 48 when my buddy and I left my house, right on the water, and headed inland towards Sebring. Of course, I never drive with the top up, unless it's raining. The temps dropped steadily, and by the time we within 30 miles of Sebring, it was in the high 30s. We weren't heavily dressed, no hats, but with the seat heaters on high and the heater on, it was a pretty nice drive. We were actually colder out on the race course, standing in the shade, watching the racers fly by.
So, after working the morning, cruising the pits and having lunch, we headed home. By then, it had warmed up to the low 70s, and we had a marvelous cruise home. BTW, we ended up with sunburns.
Gotta love the Boxster S!
Pat