A Storm moon, according to weather folklore, is the moon which occurs
in March during shifting weather patterns in the northern hemisphere.
This is the month when Spring finally arrives, around the time of the
Equinox, and we see new life begin to spring forth.
As the temperature begins to warm and the ground begins to thaw,
earthworm casts appear, heralding the return of the robins. The more
northern Native American tribes knew this Moon as the Full Crow Moon,
when the cawing of crows signaled the end of winter; or the Full Crust
Moon, because the snow cover becomes crusted from thawing by day and
freezing at night.
March’s Full Moon was traditionally called the Full Worm Moon
by Native Americans who used lunar phases to track the seasons.
Colonial Americans also used these names, especially those of the local
Algonquin tribes who lived between New England and Lake Superior.
At the time of this Moon, the ground begins to soften enough for
earthworm casts to reappear, inviting the return of robins and migrating
birds—a true sign of spring.