Some years ago there was a news item about research into how the brain puts out a chemical that helps ramp up the system to deal with colder weather. If I remember correctly it takes a few weeks to work into the system as the temps drop.
However, that chemical can be quickly lost from the system within hours as the temps go up.
It's one of the reasons folks who go south for a winter vacation are shocked by the heat when they get off the plane down south, . . then after a few days there, are shocked by the cold when they get off the plane back home.
A few days of warm up in Spring makes us too warm at first. Then when the temps dip down just a bit, it can feel colder than what we were used to only a week, or so, earlier.
See, having a coal stove can help prevent chemical abuse !