Today, my wife and I had to travel to Nashville, TN; the trip lasted about 2-3 hours, even though the posted speed limit signs were 70MPH and we always drive faster than what is posted.
We left our location (1,161 feet above sea level)., and it was 32 degrees outside; halfway into our trip, our temperature outside was 22 degrees and we were on top of the Cumberland Plateau (4,222 feet above sea level). A 10-degree drop in temperature for 3,000 feet, or a 1-degree temperature drop for every 300-foot increase in height.
However, we are talking about the end of February... so, the ratio may be different next month or even the next day...
What struck me about our trip was not so much the change in temperatures but how fast the traffic was moving despite the posted speed limits.
Sometimes, I would be driving 75MPH to 80MPH and cars would be passing me as if I was standing still; they had to be traveling close to 90MPH or even faster.
During our three-hour trip, I never saw one highway patrol vehicle either going to Nashville or returning home from Nashville.
On our way back, we stopped at Buc-ee's and filled up with gasoline (about a dime cheaper than at home) and got something to eat and drink. If you don't know Buc-ee's, it has a huge inside store, that you could spend an hour in if you wanted. It also has 120 gasoline pumps and well as 20 or so electric charging stations.
