apropos of nothing
mizzling, vbl. n.
(var., misling; also ppl. a.) ‘The action of mizzle — the falling of very fine rain; fine rain or drizzle’ — thus the OED. A variety of precipitation called by vulgar persons (such as myself) spitting, on account of its exasperating (nay, provocative) inconsistency: it is neither really rain nor really mist. Although too feeble to necessitate an umbrella, a good mizzling still manages to soak through any sort of outer garment one happens to be wearing, rendering anyone so unfortunate as to be abroad both damp and irritable.
1665 Pepys 15 September a cold misling morning.