It depends on the region. The average temperature in most parts of the country at the beginning of the summer is around 18~20 ℃. China has a vast territory from north to south. The temperature difference between north and south is large, and the same area fluctuates frequently. The temperature in the rest of South China is about 20 ℃; In the low elevation valley, summer heat was felt as early as the middle of April, and the temperature at the beginning of summer had reached more than 24 ℃. So it's cool in the north and hot in the south after the beginning of summer.
After the beginning of summer, the temperature generally rises, which will cause the human body to sweat a lot. The sweat itself is odorless, but if it stays on the skin and underwear for a long time, it will ferment and deteriorate and have a bad smell. Therefore, you should eliminate sweat in time when sweating, otherwise you are prone to eczema and sweat spots. In addition, linen, silk and cotton fabrics with good air permeability, moisture absorption, moisture removal and heat dissipation should be selected as the intimate underwear fabrics. The underwear should be washed and changed frequently, and should be aired in the sun.