The Collaborative International Dictionary of English v.0.48:

Inclemency \In*clem"en*cy\, n.; pl. Inclemencies. [L.
   inclementia: cf. F. incl['e]mence.]
   [1913 Webster]
   1. The state or quality of being inclement; lack of clemency;
      lack of mildness of temper; unmercifulness; severity.
      [1913 Webster]

            The inclemency of the late pope.      --Bp. Hall.
      [1913 Webster]

   2. Physical severity or harshness (commonly in respect to the
      elements or weather); roughness; storminess; rigor; severe
      cold, wind, rain, or snow.
      [1913 Webster]

            The inclemencies of morning air.      --Pope.
      [1913 Webster]

            The rude inclemency of wintry skies.  --Cowper.

   Syn: Harshness; severity; cruelty; rigor; roughness;
        storminess; boisterousness.
        [1913 Webster]

WordNet (r) 3.0 (2006):

inclemency
    n 1: weather unsuitable for outdoor activities [syn: bad
         weather, inclemency, inclementness] [ant: good
         weather]
    2: excessive sternness; "severity of character"; "the harshness
       of his punishment was inhuman"; "the rigors of boot camp"
       [syn: severity, severeness, harshness, rigor,
       rigour, rigorousness, rigourousness, inclemency,
       hardness, stiffness]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "inclemency":
   absolute zero, acuteness, algidity, animality, astringency,
   atrocity, austerity, barbarity, bitterness, bleakness, bloodlust,
   briskness, brutality, chill, chilliness, cold, coldness, cool,
   coolness, coolth, crispness, cruelty, cryogenics, cryology,
   decrease in temperature, destructiveness, extremity, ferociousness,
   fierceness, flintiness, force, freezing point, freshness,
   frigidity, frostiness, furiousness, gelidity, grimness, hardness,
   harshness, heartlessness, iciness, impetuosity, inexorableness,
   inhumanity, intense cold, intensity, keenness, low temperature,
   malignity, mercilessness, mindlessness, murderousness, nip,
   nippiness, pitilessness, rawness, relentlessness, remorselessness,
   rigor, roughness, ruthlessness, savagery, severity, sharp air,
   sharpness, short shrift, sternness, stringency, tender mercies,
   terrorism, uncompassionateness, unfeelingness, unforgivingness,
   ungentleness, unmercifulness, unremorsefulness, unsympatheticness,
   unyieldingness, vandalism, vehemence, venom, viciousness, violence,
   virulence