Huh. 3 ski resorts and ~10,000ft of elevation implies snow.

Yes, it does. However, what the snowmelt does is what is critical. For example, here in the Southwest, we have the Colorado River. It is fed primarily from snowmelt from the Colorado Rockies. It does not run through Denver (where I went to high school). Denver, when I was there, had water restrictions based on your address (even vs odd number). You couldn't wash your car, or windows, or water your lawn on certain days.

The snowmelt primarily travels westward, where the River forms and flows southwest. It feeds Utah, Nevada, Arizona, and California. And some of the western slope of Colorado (where there are no major towns).

I am not an authority on Iran's situation, but if the snowmelt goes a different way, it may do Tehran no good at all (just like Denver).

Also, weak snowfall in the Rockies results in weak run-off, and the River doesn't flow as strongly. That has happened several times over the past 20 years.

It's very possible that Iran is messing up. Wouldn't surprise me at all. It's also possible that weather and terrain are working against them. I suspect it's a combination of both things. I find no credible information that Iran is planning to evacuate Tehran, and at least one official has said it "makes no sense at all".

Which is likely correct. There's over 9M people in Tehran. Not really practical to relocate them.