Why is there such a big difference between the weather in Tangshan and Tianjin?

This is related to the topography, coastal location and water flow direction of the two places. Due to geographical proximity, the climate difference is not obvious.

Tangshan city belongs to the continental climate zone of warm temperate zone and semi-humid monsoon type. Winter is controlled by polar continental air mass, with cold climate and scarce rain and snow; In spring, due to the influence of continental air mass, there is not much precipitation, and because of the prevailing northerly or westerly winds, the evaporation increases, often forming dry weather; In summer, due to the northward shift of the Pacific subtropical high ridge, the warm and humid air flow from the southwest or southeast ocean surface is transported northward, which becomes the main precipitation season; In autumn, the southeast monsoon weakens, the polar continental air mass gradually strengthens, and autumn gradually turns into a crisp rainy season.

There are seven types of weather systems that affect our city in summer, namely northeast depression, East Mongolia vortex, cold drop, west trough, transverse shear, Yellow River cyclone and typhoon. According to statistics, the west trough and cold drop are the main weather systems that affect our city. Because it is located on the north bank of Bohai Sea, when tropical cyclones, strong cold air and temperate cyclones pass through, the combination of strong wind and air pressure will easily lead to the accumulation of seawater on the windward shore, and even make the water in the sea area react as a whole to form a storm surge.

The annual average temperature in the city is 10.6℃, the lowest in June, and the monthly average temperature is -5 ~-8℃, and the lowest can reach -26℃. The highest temperature is in July, the monthly average temperature is 25 ~ 26℃, and the highest temperature is 40℃.

Tianjin is located on the east coast of Eurasia in mid-latitude, and it is dominated by monsoon circulation. It is an area where East Asian monsoon prevails and belongs to temperate monsoon climate. The main climatic characteristics are: four distinct seasons, windy spring, drought and little rain; Summer is hot and the rain is concentrated; Autumn is cool and the temperature is moderate; Winter is cold, dry and snowy. The annual average temperature in Tianjin is11.4 ~ 12.9℃, the highest average temperature in urban areas is12.9℃, and it is the coldest in June, with an average temperature of-3 ~-5℃. It is the hottest in July, with an average temperature of 26 ~ 27℃. The monsoon prevails in Tianjin, with the maximum wind speed in winter and spring and the minimum wind speed in summer and autumn. The annual average wind speed is 2 ~ 4m/s, mostly southwest wind. The average frost-free period in Tianjin is 196~246 days, the longest frost-free period is 267 days, and the shortest frost-free period is 17 1 day. Among the four seasons, winter is the longest, 156~ 167 days; Summer comes next, 87~ 103 days; 56~6 1 day in spring; Autumn is the shortest, only 50~56 days. The average annual precipitation in Tianjin is 520 ~ 660mm, and the number of precipitation days is 63~70 days. In terms of regional distribution, there are more mountains than plains, and more coastal areas than inland areas. According to the seasonal distribution, the precipitation in June, July and August accounts for about 75% of the whole year. Tianjin has long sunshine hours, with annual sunshine hours of 2500~2900 hours.