Search Result for "cloudlessness": 
Wordnet 3.0

NOUN (1)

1. the lightness of a sunny day when there are no clouds in the sky; 



The Collaborative International Dictionary of English v.0.48:

Cloudless \Cloud"less\, a.
   Without a cloud; clear; bright.
   [1913 Webster]

         A cloudless winter sky.                  --Bankroft.
   -- Cloud"less*ly, adv. -- Cloud"less*ness, n.
   [1913 Webster]


WordNet (r) 3.0 (2006):

cloudlessness
    n 1: the lightness of a sunny day when there are no clouds in
         the sky