The answer is: The phrase "the next warm Weather, naked" adds humor.
In the excerpt from "A Witch Trial at Mount Holly," the author Benjamin Frankin makes a parody of Puritan society. He imitates the style of Protestant writers of the time with intentional exaggeration to create a comical effect.
For future students the answer is The phrase "the next warm Weather, naked" adds humor. I can confirm this because I got an A+ on my quiz.