I remember when I was maybe 10 years old my family went to Florida for Christmas. There was a cold snap and daytime highs were maybe 60F? Kind of rare.
Anyways, I wanted to swim in the unheated outdoor pool. The thermometer said it was 50F (10C).
It felt like I had been punched in the nuts after 5 seconds in the pool.
Several years ago, went sailing on a friend's dad's boat during the air and water show in mid-August. That's about when the water temp is going to hit its peak, and about 1/2 mile out from shore, it was cold enough that we could only stay in the water for 5-10 minutes at a time.
Anyways, I wanted to swim in the unheated outdoor pool. The thermometer said it was 50F (10C).
It felt like I had been punched in the nuts after 5 seconds in the pool.
Can’t imagine what 1C feels like.