The Collaborative International Dictionary of English v.0.48:

Misle \Mi"sle\, v. i. [imp. & p. p. Misled; p. pr. & vb. n.
   Misling.] [Prop. mistle, fr. mist. Cf. Mistle, Mizzle.]
   To rain in very fine drops, like a thick mist; to mizzle; to
   drizzle. [archaic]
   [1913 Webster]