Salty, this puzzle makes my head hurt! But the dates you gave are both days when snow fell in San Francisco.
I just can't wrap my brain around the "uphill both ways part.
OK: You have the significance of the dates. So if snow fell in San Francisco, what great American University might it (actually did) also have fallen on on those dates?
Now, say you are through-hiking the JMT, say you leave your car at the Portal, hitch to Lone Pine, grab CRESTA to Lee Vining, YARTS to Yos Valley. JMT to Whitney, Trail Crest and the Portal.
What's the elevation at the Portal? At what elevation did you leave Inyo NF? At what elevation did you enter Yosemite NP? At what elevation did you leave Yosemite NP? At what elevation did you re-enter Inyo?
Between Inyo and Yos, isn't that uphill in both directions?
