The Christmas 2015 Full Cold Moon
The last time we had a full moon on Christmas was 1977!! And, tonight's full moon has a lunar halo. I just took this photo at midnight and was thrilled to see the lunar halo. I've not seen one ever before.
A lunar halo is caused by the refraction, reflection, and dispersion of light through ice particles suspended within thin, wispy, high altitude cirrus or cirrostratus clouds. The phenomenon of a lunar halo is similar to a rainbow produced by sunlight and rain falling between your eye and the sun.
Weather lore says a lunar halo is the precursor of impending unsettled weather, especially during the winter months. This is often proved true, as cirrus and cirrostratus clouds generally precede rain and storm systems.