Originally Posted by xdog1
The odds are not in your favor. Pray.
I'm not sure why you would say that. Utah generally has some of the best early season conditions around. See the chart below on data from the USFS Alta guard station (lower-mid mountain). Alta, which also gets ~500" annually, is subjected to the same weather patterns as Powder Mt. Alta does benefit from the local lake effect, but also misses out on some of the storm systems that graze the nothern border of Utah, so call it a wash. Anyway, on average, expect 60+ inches of snow on the ground that time of year. Powder Mountain has gentler (less rocky) slopes, so the amount of nsow required to cover rocks is less. The sun is lowest on the horizon that time of year, so the snow that falls is usaully of excellent quality and stays fresh for long periods of time. Generally, Utah resorts (PM & SB included) will have most terrain open by mid December, since it's a dress rehersal for the Xmas crush. Not all lifts will be operational for $$ reasons, but all terrain is usually open. You should be fine.
Edit: OK the chart ended up sucking. Heres the results you need to know: 85" snow on average fall in December (on top of the 82" that fall in November), 62" on average on the ground at the 8,800' level in December.