Watermelon snow, or blood snow, is snow that is reddish or pink in color, with the slight scent of watermelon. Watermelon snow is caused by the presence mainly ofChlamydomonas nivalis, a species of green algae containing a secondary red carotenoid pigment. Unlike most species of fresh-water algae, it thrives in freezing water. This type of snow is common during the summer in alpine and coastal polar regions worldwide, such as the Sierra Nevadas of California. Here, at altitudes of 10,000 to 12,000 feet (3,000–3,600 m), the temperature is cold throughout the year, and so the snow has lingered from winter storms. Compressing the snow by stepping on it or making snowballs leaves it looking red. Walking on watermelon snow often results in getting bright red soles and pinkish pant cuffs.
