Not GP, but hypothermia strikes more people in summer than winter. In winter, folks know to prepare for it. In summer, they wonder how they could possibly get hypothermia. Then a thunderstorm drenches them and washes out a bridge.
It doesn't even have to be that cold to die of hypothermia. Just cold enough that your body can't maintain above 82°F. If immobile, like due to injury, that can happen at 50°F. Quite possible in the mountains, esp with windchill.
Sure, there are a lot of ifs in that scenario. But it does happen. And it is usually easy enough to buy polypro pants.
