That makes no sense. Why would water on a road at 37F affect a car differently from water on a road at 42F? The properties of water are no different at those temperatures - is there some property of the tires that changes below 40F?It’s any kind of wetness if temps get below 40. It all depends on the temps.
I didn’t swap on my winter tires this winter, so I’m still on summer high performance tires. As great as they are in warm weather, their performance goes downhill fast starting at 45 on down.
Still okay on dry pavement, and manageable down to 40 on wet pavement. But much colder and/or wet it becomes downright dangerous. Would have to creep around which pretty much renders the whole exercise pointless.
Lots of stories in car forums about people driving in freezing temps on summer tires sliding off the road even in gentle turns. Guy I know from Novita wrecked his new (to him) Camaro ZL1 1LE up near Chester in exactly that circumstance.