superfrost

Noun

 * 1)  Groundwater that is found immediately above the permafrost layer, which seasonally thaws, but is kept frozen more of the year due to the cold from the permafrost layer.
 * 2) An exceptionally severe frost.
 * 1) An exceptionally severe frost.
 * 1) An exceptionally severe frost.
 * 1) An exceptionally severe frost.