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I took a set of UHP summer tires into cold temps (below ~43º) twice. Both times the tires felt more like hard plastic than any form of rubber. It started to snow a little (like a dusting) and the temp was around 37º when the car became pretty much undriveable; it was that unsafe! This was also at speeds less than about 35mph.
Your life isn't worth pushing to get the most out a set of tires. Just suck it up and have either 3 sets of tires or ditch the UHP summer (they're called "summer" for a reason) tyres for a good set of all-seasons.
After those 2 experiences I refused to visit my sister-in-law's mountain once the temps started falling; until I went to an all-season tyre.
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