Notice that the snow in this footage appears to be remarkably dense. This is common in coastal areas of central Honshu where the bulk of the snow falls at temperatures near 0˚C (32˚F). Nagaoka is a remarkably snowy city, with a mean annual snowfall of 500 cm (236 inches), but the average temperature in January, the coldest month of the year, is 1.3˚C (34.3˚F).
Former Powder Magazine editor Steve Casimiro once asked, "do you ever wonder what it would be like if it started snowing and never stopped?" The residents of Nagaoka got a pretty good idea in 1963.