None of the Bend area stations appear to have ever recorded June snowfall (I know you're a bit higher up). Wickiup Reservoir west of La Pine and about 4,300' has recorded some once - .3" in June 1980. Assuming it wasn't actually hail, which I know has been occasionally recorded as snowfall some places.
DEN officially recorded less than an inch of June snowfall a couple of times, both in the early 1950s.
It's almost like ENSO is just one factor among many...albeit probably the best single indicator as far as dominant weather patterns likely to play out.
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