Yeah weak Ninas are good for snow in December. Ninas in general are good for snowy Decembers but you are right that the weak ones seem to have fewer duds mixed in. Dec 2016 was kind of near average. But Dec 2017, 2008, 2005, 2000, 1995 were all above average for the most part (2000 was kind of meh along the coast but good inland)...Dec ‘71 wasn’t great but Nov ‘71 was lol...and then the rest of winter was big. Dec 83 was similarly good inland but pretty mediocre right on the coast.