Abstract: If we designate the days with a mean temperature of below 10℃ as wintery days with a mean temperature over 22℃ as summery and the period between the two as spring or autumn,then there are tour months each of summer and wintery aid only two months each of spring and autnmn in Nanking. Spring in Nanking is the season when wintor northeast monsoon and summer southeast monsoon have a struggle for supremacy, storms and showers are quite frequent winds reach the maximum veocity of the years and temperature is comparatively cool.