The Collaborative International Dictionary of English v.0.48:

Besnow \Be*snow"\, v. t. [imp. & p. p. Besnowed.] [OE.
   bisnewen, AS. besn[imac]wan; pref. be- + sn[imac]wan to
   snow.]
   1. To scatter like snow; to cover thick, as with snow flakes.
      [R.] --Gower.
      [1913 Webster]

   2. To cover with snow; to whiten with snow, or as with snow.
      [1913 Webster]