What climate does Chengde belong to geographically?

Chengde is a municipality under the jurisdiction of Hebei Province, which is located in the transitional zone between North China and Northeast China. The southwest and south are adjacent to Beijing and Tianjin respectively, and it is backed by Mongolia and Liaoning.

Chengde belongs to the temperate monsoon climate zone, located between the largest continent, Asia and Europe, and the largest ocean Pacific, with significant differences in thermal properties between land and sea. In summer, the Eurasian continental depression is connected, the ocean subtropical high extends westward and advances northward, and the southeast monsoon from the subtropical high in the North Pacific brings abundant precipitation. The northwest monsoon from the powerful Mongolian high in winter affects the local area. Because the wind shear meets the requirements of monsoon, it is a monsoon climate.

In winter, affected by the northerly winds in high latitudes inland, polar continental air masses prevail, which are cold and dry; In summer, influenced by polar ocean air mass or denatured tropical ocean air mass, southeast wind and southeast wind prevail, with warm, hot and rainy seasons. The annual precipitation is mostly 500~ 1000mm, of which about 2/3 is concentrated in summer (hot and rainy in summer and cold and dry in winter). There are four distinct seasons throughout the year and the weather is changeable. With the increase of latitude, the temperature amplitude in winter and summer increases correspondingly, while the precipitation decreases gradually. The change of wind direction has obvious seasonality. Although influenced by mountainous terrain, it still has its dominant characteristics after filtering out the changes caused by local factors. In winter12 ~ February, northerly winds predominate, and in summer, southerly winds predominate from June to August. Spring and autumn are the transitional seasons of these two kinds of airflow, with spring near summer and autumn near winter. In addition to the static wind, the maximum wind direction in the whole year is southwest and northwest. Average annual wind speed 1.4-4.3m/s, and 3.3-4.3m/s on the dam. The number of windy days in the whole year is 1 1-63. Fengning, Weichang, Longhua, Chengde and other counties have windy days, up to 63-93 days. Up to 1 16 days on the dam.

The distribution of annual average temperature gradually increases from north to south. The annual variation characteristics of the average temperature are: the temperature rises month by month from February, July is the hottest month, August is the beginning of cooling, and 1 month is the most Leng Yue. [2]

The annual rainfall is 402.3-882.6 mm, 627. 1-882.6 mm in the south, with a maximum of 1500.2 mm and a minimum of 298.0 mm; Middle 501.0—609.1mm, maximum 923.8mm, minimum 206.8mm North 402.3-5 15.4 mm, maximum 885.6 mm and minimum 249.0mm；; Bashang 411.6 —— 514.0mm, with a maximum of 627.9mm and a minimum of 298.8mm Due to the influence of topography, the windward slopes of Wuling Mountain and seven old Tushan are two rainy areas in our area. The distribution of rainfall has obvious dry-wet dividing line and seasonal variation characteristics. The rainfall from March to May in spring is 55.5-74.7mm, accounting for 10- 12% of the annual rainfall. The rainfall from June to August in summer is 24 1.5-542.4 mm, accounting for 56-75% of the annual rainfall. The autumn rainfall is 66.4- 102. 1mm, accounting for14-16% of the annual rainfall; Rain and snow are scarce in winter, accounting for 1-3% of the annual rainfall.