I've noticed the sky often appears darker than normal after a storm system has passed through. I used to attribute this to the air having been cleansed of aerosols by the rain. But another thought occurred to me this morning as I stepped out onto my wet patio. Wet pavement is typically darker than dry pavement. Could the darker skies after rain be due to less light being reflected up from the ground? Snow cover certainly increases sky glow, so maybe wet surfaces after rain have the opposite effect.
Edited by earlyriser, 19 January 2019 - 05:27 AM.