Climate conditions in Shanghai

Shanghai is located in the eastern part of the Yangtze River Delta where the rivers and seas meet, in the north subtropical region where the East Asian monsoon prevails, and belongs to the north subtropical monsoon climate. Affected by the advance and retreat of the winter and summer monsoon, the northwest wind prevailed in Shanghai from June165438+1October to February of the following year, with a cold and dry climate, and the southeast wind prevailed from April to August in summer, which was warm, hot and humid. However, under the direct control of the subtropical high in the northwest Pacific, southwest winds sometimes blow in July and August, and the weather is hot and dry. March and early September to 10 are the transition seasons of monsoon transition, with northeast wind and east wind as the main winds, with more low temperature and rainy weather.

The main climatic characteristics of Shanghai: Leng Xia is hot in winter, with four distinct seasons, but there are often cold currents in winter; In the same season of rain and heat, there is abundant precipitation, but the variability is large; Light and temperature are coordinated, and there are many sunshine, but it varies from year to year. According to Shanghai meteorological data statistics (1873 ~1994); The annual average temperature is 15.5℃, the coldest in June is 1, and the average temperature is 3.4℃. It is the hottest in July, with an average temperature of 27.5℃. The frost at the end of April 1,1the frost at the beginning of October 1 16, with an average frost-free period of 228 days. The active accumulated temperature above 10℃ is 4934℃/ day, which is second only to Sichuan Basin and the south of Hangzhou, Anqing, Wuhan and Yichang. Average annual precipitation 1 149.8 mm, precipitation days 13 1 day. The average monthly rainfall from April to September is above 100 mm, and the total rainfall in these six months accounts for about 70% of the total rainfall in the whole year. June and September are two obviously rainy months.

The monthly rainfall in June reached more than 150 mm, which was caused by plum rain and autumn rain (including tropical cyclones) respectively. The sunshine in each month is above 150 hours, and there are more sunshine in July and August, reaching 25 1 and 260 hours respectively. In June 5438+10, the climate was cool, sunny and rainy, and the temperature difference between day and night was large.

Generally speaking, the climate in Shanghai has three characteristics.

First, Leng Xia is hot in winter with four distinct seasons, but there are often cold currents.

Second, in the same season of rain and heat, there is abundant precipitation, but the change range is large.

Third, the light and heat are coordinated, and there is more sunshine, but it is changeable all year round.