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Tianjin is located in the north temperate zone and the east coast of Eurasia in the middle latitude. It is dominated by monsoon circulation, and it is an area where East Asian monsoon prevails, with a warm temperate and semi-humid monsoon climate. Near Bohai Bay, the influence of marine climate on Tianjin is obvious. 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, so late spring, early summer and autumn are the best seasons to travel to Tianjin. There is northerly wind in Dorsey in winter, with low temperature and little precipitation. In the summer half year, the subtropical warm high pressure in the Pacific Ocean is strengthened, with southerly winds as the main factor, high temperature and heavy precipitation.

Sometimes there is a spring drought. The average annual temperature in Tianjin is about 14℃, and it is the hottest in July, with an average monthly temperature of 28℃. The highest temperature in history is 4 1.6℃. 1 is the coldest month with an average monthly temperature of -2℃. The lowest temperature in history is-17.8℃. The average annual precipitation is between 360 and 970 mm, and the average (from 1949 to 20 10) is about 600 mm.

Tianjin straddles the banks of the Haihe River, which is the largest river in northern China. There are more than 300 tributaries whose upstream length exceeds 10 km, and they flow into the North Canal, Yongding River, Daqing River, Ziya River and South Canal near the middle reaches.

Five rivers merge into the Haihe River at the Sanchakou near Tianjin Jingang Bridge and enter the sea from Dagukou. The main stream is 72 kilometers long, with an average river width of 100 meter and a water depth of 3-5 meters. Historically, this river was navigable for 3000 tons of seagoing ships.

Thirty-five kinds of mineral resources have been discovered in Tianjin, including 5 kinds of energy minerals, 6 kinds of metal minerals, 2/kloc-0 kinds of non-metal minerals and 3 kinds of water gas minerals.

At present, the minerals mined in Tianjin are oil, natural gas, geothermal and mineral water. The nearby sea area is rich in oil and natural gas resources, with proven oil reserves exceeding 654.38+0.9 billion tons and natural gas reserves of 63.8 billion cubic meters. Yantian covers an area of 263 square kilometers, and the annual output of sea salt is 6.5438+0.88 million tons. It is one of the largest sea salt producing areas in China.