Went out and measured 17.0" average on the ground. Now I'm annoyed I didn't set up a board so I could clear at the appropriate intervals - would've probably managed 20". Was mostly IP and/or ZR from 12pm to 6pm. Will measure SWE tomorrow morning.
8:25pm report of 18.5" here in Bradford, NH. I'll go grab a measurement of my own here in a bit but that seems accurate.
Pretty amazing given there was a multiple hour switch to IP and ZR in the middle.
These hand rails only had about 0.2" of IP/ZR crud on them before it flipped back to snow and they're already past the point where they can't hold anymore.
Edit: I only have a screengrab from a video of the railing after it already flipped back, but these were taken only 48 minutes apart.
I really was too overconfident in its ability to stand up to snow and should have cleared it off more than the one time I did before going to bed. Thankfully there's nothing really delicate or important in there.
Looks like weather is going to put a bit of a hold on the barn project, so here's an update! See also the (mostly accurate) framing model I put together. (I don't plan on leaving the rafter tails like that, for example.)