Old snow
Snow is beautiful when it first falls, and here for some time afterward because there isn't much traffic exhaust to blacken the snow. But eventually it does get dirty, and it does melt, and then everything looks really yucky. There is no other way to put it--yucky.
The ground is muddy with clumps of dirty ice melting, the snow is rotting with blackened edges, and all sorts of long forgotten things surface from below the snow. It is not a great time of year, and certainly one never featured in calendars!