Source : Webster's Revised Unabridged Dictionary (1913)

Frore \Frore\, adv. [See {Frorn}.]
   Frostily. [Obs.]

         The parching air Burns frore, and cold performs the
         effect of fire.                          --Milton.

Source : WordNet®

frore
     adj : very cold; "whatever the evenings be--frosty and frore or
           warm and wet"