The Collaborative International Dictionary of English v.0.48:

Siccity \Sic"ci*ty\, n. [L. siccitas, fr. siccus dry.]
   Dryness; aridity; destitution of moisture. [Obs.]
   [1913 Webster]

         The siccity and dryness of its flesh.    --Sir T.
                                                  Browne.
   [1913 Webster]