The most accurate response regarding the setting differences between "The Rainy Day" and "Mending Wall" is:
"The Rainy Day" takes place when the weather makes it unpleasant to be outside. "Mending Wall" takes place when it is pleasant enough to be outside.
"The Rainy Day" conveys themes of melancholy and introspection, set during dreary, rainy weather, while "Mending Wall" has a more neutral, outdoorsy setting that facilitates the exploration of themes related to boundaries and human interactions in a more pleasant environment.