Does it Ever Actually Turn Blue? Yes, but only in extremely rare atmospheric conditions. Large volcanic eruptions (like Krakatoa in 1883 or Mount Pinatubo in 1991) or massive forest fires can send ash and smoke particles of a very specific size into the air. These particles scatter red light and allow blue light to pass through, giving the moon a blue-green tint. The saying "once in a blue moon" means something happens very infrequently, which perfectly describes how seldom the moon physically appears blue or how rare an extra lunar cycle is. Dear Doris, Have A Good Night Under The Blue Moon Light Pleasant Dreams Darlin' Always Loves And Hugs, XXOO ~WW~ {Sue}
