The Collaborative International Dictionary of English v.0.48:

Clemency \Clem"en*cy\, n.; pl. Clemencies. [L. clementia, fr.
   clemens mild, calm.]
   1. Disposition to forgive and spare, as offenders; mildness
      of temper; gentleness; tenderness; mercy.
      [1913 Webster]

            Great clemency and tender zeal toward their
            subjects.                             --Stowe.
      [1913 Webster]

            They had applied for the royal clemency. --Macaulay.
      [1913 Webster]

   2. Mildness or softness of the elements; as, the clemency of
      the season.

   Syn: Mildness; tenderness; indulgence; lenity; mercy;
        gentleness; compassion; kindness.
        [1913 Webster]

WordNet (r) 3.0 (2006):

clemency
    n 1: good weather with comfortable temperatures [syn:
         mildness, clemency]
    2: leniency and compassion shown toward offenders by a person or
       agency charged with administering justice; "he threw himself
       on the mercy of the court" [syn: clemency, mercifulness,
       mercy]