The whole record
Snow depth through the season for every year on record, plotted on the days it was actually measured. The bands behind are our five grades of cover, worked out from each mountain's own history. The spread is the point: Australian seasons vary enormously, and nobody picks a good one in advance.
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The grades. The five bands come from the mountain's own record, cut at the 20th, 45th, 75th and 92nd percentile of in-season depth and rounded to the nearest 10 cm. That means the same word describes a similar quality of season at each resort, even though the numbers differ: the Victorian resorts run shallower than the Snowy Mountains, so borrowing one set of thresholds for both would have been wrong. Full working on the method page.
The odds. The second chart is the more useful one for planning. It gives the share of seasons that reached each grade at that point in the year. A median tells you the middle of the range; the odds tell you how often it actually happened, which is what you want before committing to dates.
Gaps are real. Lines are drawn through the dates each site was actually read, so a straight run means no reading, not flat snow. Spencers Creek is read roughly weekly; the Victorian resorts recorded daily. The current season is still running.