If one was looking to book a trip to the SLC area, what week/month would be the closest thing to 'sure thing' for good snow conditions? Understand it can't necessarily be predicted, but certainly there are better times than others.
Statistically, you can answer it. Looking at
http://bestsnow.net and
http://zrankings.com (which uses some bestsnow data) gives you a bunch of historical info.
Here's the Bestsnow page for Utah :
http://www.bestsnow.net/utahnet.htm which includes the odds of a 6"+ powder day, but doesn't break things down by month.
And here are the ZRankings snow graphs for Alta, the first showing the best coverage/depth, and the second showing the relative snow comparison to other resorts.
Of course, Alta ranks number 1 for snow, so the first graph reaches 100%, and the second is pegged at 100%. Looking at Snowbasin gives a different picture :
Now this doesn't
quite address conditions, since that will depend on how recently snow actually fell, and how light it is, which is impossible to predict accurately more than a few days in advance. But it does say when the most terrain is likely to be open, and when there should be the best chances of getting snow.