The weather outlook is dry, dry, dry but we could start to see some changes at the end of the month.
This is an excellent blog that discusses Sierra weather (specifically snowfall for Mammoth):
https://www.mammothsnowman.com/mammoth-mountain-powder-forecast/The December snow is generally well-consolidated but there is a wide range of surface condition across the range. The avy center has the most detail on snow conditions, although it is centered around the Mammoth area and doesn't get a ton of reports from the southern Sierra.
https://www.esavalanche.org/
