Mizzle is a fine word, because despite being dialect and obscure it's meaning is obvious to absolutely anybody. It means that it's half way between drizzle and mist, which by coincidence is precisely what it's doing in London now. There's also a slight suggestion of misery and snivel.
Mist also has the lovely linguistic property that it goes all the way back to Proto-Germanic *mikhstaz and then to Proto-Indo-European *migh from which the ancient Indians got the Sanskrit megha, meaning mist.
LAWD sufferers would start hanging the washing out to dry