You can notice this effect in your life as well. I don't know where you live, but I know here in the north, 40F is "freezing" cold in November for many people. And when March rolls around, 40F is cause for breaking out the t-shirts. Your body will adapt to the cold to a certain degree. I think I saw it explained on a reddit "ask science" post some time ago, but I cannot remember the physiological details of these temporary adaptations to climate patterns.