And by December first, we're all the way down to 49 degrees for a normal high temperature and 33 degrees for a normal low. And, remember, we're less than 100-days away from December 1st. The reason is in this AccuFacts file. There is still a lot of water vapor in the air during this time of year. However the nights are getting longer and longer as fall approaches.
More darkness means more time for the temperature to drop to the dewpoint.
The dewpoint is the temperatures at which water vapor condenses and fog forms. As Debby keeps moving west, it's losing power all because of the water, or rather the lack of it. The power drain for Debby is explained in this AccuFacts file. All hurricanes and tropical storms like Debby get their energy from the water. The humid air from the ocean's surface rises.