Eli5: I keep my AC at 21 celsius all year. How come I’m hot in a shirt in summer and cold with a sweather in winter?

Question

Eli5: I keep my AC at 21 celsius all year. How come I’m hot in a shirt in summer and cold with a sweather in winter?

In: 1

Answer 1

Most likely, this is due to humidity. In the winter time, humidity is usually much lower because cooler air holds less moisture. In the summer, humidity rises which can make it feel warmer.

Example: 21c (69.8f) at 50% humidity feels like 21c (69.8f)

21c (69.8f) at 80% humidity feels like 22c (71.6f).