Yeah I think Rogers Pass has the record at -70° IIRC? At the least it’s probably worth pulling the sensor and testing it in the chamber. I remember the Allagash ME site breaking the Maine record years ago, but it was found to be too cold. Eventually the Big Black River HADS site broke it with -50°. A lot of these river HADS sites are going to eventually overtake their state record mins since many are sited in pits. There’s quite a few up here that run the coldest in their counties on rad cooling nights.