SAN FRANCISCO (KGO) -- The skies gave us the perfect spooky setting for Halloween night known as the Blue Moon.
The phenomenon happens whenever there are two full moons in the same month -- hence the saying "once in a blue moon."
The last full moon was October 1 - setting us up for this rare event.
It's also the first time a Halloween full moon has appeared for all time zones since 1944, according to Farmers' Almanac. The last time a Halloween full moon appeared was for the Central and Pacific time zones in 2001.
Check out the time-lapse video in the media player above