Kifo,
you damn lucky dude...
I got hit by blizzard while 3/4 up Mt Asahidake on 29 Sep, couldn't make it across to Kurodake, then Sounkyo.
Local hikers told me it was the 2nd day of snow for Japan, and it got reported in local TV too.
Shiretoko wasn't any better too, sightseeing ferries got cancelled throughout the whole week due to high waves.
Didn't have a spare day to make another attempt on 30 Sep.
Haiz, Daisetsuzan was supposed to be highlight of my trip....
P.S. shameless plug... Xperia Z3+ is a damn good all-weather camera phone.