In the Rikubetsu town of Hokkaido Tokachi district, the low temperature in the morning of the 7th was falling below the freezing point of 23 degrees 8 in this winter It fell. By this chilling, even in the center of Rikubetsu-cho, we saw the phenomenon of "diamond dust" where the water vapor in the atmosphere turns into ice crystals and shines sparkly with the sun's light.