weatherproof

from WordNet (r) 3.0 (2006)

weatherproof
    adj 1: able to withstand exposure to weather without damage;
           "weatherproof electric wiring"; "a weatherproof coat"
    v 1: make resistant to bad weather

from The Collaborative International Dictionary of English v.0.48

Weatherproof \Weath"er*proof`\, a.
   Proof against rough weather.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

28 Moby Thesaurus words for "weatherproof":
      airtight, ballproof, bombproof, bulletproof, burglarproof,
      corrosionproof, dampproof, fire-resisting, fireproof, flameproof,
      foolproof, hermetic, holeproof, impervious to, insulate, leakproof,
      noiseproof, proof, proof against, punctureproof, resistant,
      rustproof, shatterproof, shellproof, soundproof, tight, waterproof,
      watertight