Located in Northern Arizona on the Navajo Reservation are two sandstone canyons, Lower and Upper Antelope Canyons. The only light source are the rays of sun that pierce the small openings at their surface. The light reflects off the sand particles suspended in midair and illuminate the canyon's interior.
It was rainy, cold day in the middle of summer. That's how I experienced the Grand Canyon South Rim for the first time.
I honestly think that bad weather has its positives in landscape photography. The cloudy skies work as a giant soft box, smoothing the light, thus creating soft shadows, and the dark clouds contribute for a more dramatic picture.