When does spring, summer, autumn and winter start?

According to the solar terms, it starts from beginning of spring, Changchun, beginning of autumn and beginning of winter.

Meteorologically:

Spring: If the average daily temperature is not lower than 10 degrees for five consecutive days, it is called spring in meteorology.

Summer: If the average daily temperature is not lower than 22 degrees for five consecutive days, it is called summer in meteorology.

Autumn: For five consecutive days, the average daily temperature is not higher than 22 degrees, which is called autumn in meteorology.

Winter: If the average daily temperature for five consecutive days is not higher than 10 degrees, it is called winter in meteorology.