noun (n)

• good weather with comfortable temperatures(noun.state)

  Synonym:
  clemency
  

  source: wordnet30
• acting in a manner that is gentle and mild and even-tempered(noun.attribute)

  Example:
  Even in the pulpit there are moments when mildness of manner is not enough.
  

  Synonym:
  gentleness, softness
  

  source: wordnet30
• mercifulness as a consequence of being lenient or tolerant(noun.attribute)

  Synonym:
  lenience, leniency, lenity
  

  source: wordnet30
• The quality or state of being mild; as, mildness of temper; the mildness of the winter.(noun)

  source: webster1913