Per The Weather Channel, the ethereal, multi-colored half-circle is known as a circumzenithal arc. It's not really a rainbow ...

Frigid weather can make for the most stunning ice halos. The Arctic blast pouring into West Michigan was ideal for a spectacular display Monday morning for many catching a break from lake-effect snow ...

He said what looks like an upside down rainbow is an circumzenithal arc caused by the refraction of sunlight through horizontally-oriented ice crystals.