Two weeks ago in the skies of Edmonton, Alberta, Canada during the full snow moon the sky was red.

Explanation:

The temperature was so low, -25 C, that plumes of steam rose from neighboring oil refineries. The above image was taken during a momentary break in the plumes. The rising Moon appears red here for the same reason that a setting Sun appears red — because blue light is preferentially scattered away by intervening air.

via APOD