In the United States, public places will keep constant temperature, so whether it is summer or winter, the library management will be kept at around 22 to 23, so you should be able to see American friends wear short sleeves whether it is summer or winter ~

Friends of China, you'd better bring your own clothes. It's really cold every time. I wear long sleeves almost indoors. I can't compare with these American students who grew up eating red meat ~