A very rare
weather phenomenon the "double
rainbow" is caused by double
reflection of sunlight inside the
raindrops, and appears at an angle of
50°53°. As a result of the second
reflection, the colors of a secondary
rainbow are inverted compared to the
primary bow, with blue on the outside and
red on the inside.
In southern California,
"Double rainbows are an extremely
"once in a lifetime" weather
event to witness.
The most likely
location to witness this weather
phenomenon is the deserts during monsoon season "
from late July through early
September"