I would like to ask when Shanghai began to wear short sleeves and when the hot weather came.

Wearing short sleeves usually begins when the temperature exceeds 23 degrees. In Shanghai, it usually starts in April and ends in the middle of 10.

Historical weather in Shanghai in April 20 18:

Average high temperature: 22℃, average low temperature: 15℃, extreme high temperature: 30℃ (April 30th), extreme low temperature: 7℃? (April 7).

Historical weather of 20 18 and 10 in Shanghai:

Average high temperature: 23℃, average low temperature: 16℃, extreme high temperature: 27℃ (10.04), extreme low temperature: 12℃? (65438+1October 27th).