Geographical environment of Jiaocheng district

The main river with hydrological conditions is Huotongxi, with the main stream 126km (68km in China), the drainage basin of 2244km (5 17.5km in China) and the tributaries of Chixi. Qidu Stream is 58 kilometers long with a drainage area of 334 square kilometers. East Lake, the main lake, covers an area of 3 square kilometers; The artificial lake Kim Reservoir covers an area of 72 hectares. Climatic conditions: annual average temperature19.0℃; 1 year, the average temperature is 9.6℃, and the average temperature in July is 28.7℃. The extreme maximum temperature is 38.5℃ and the extreme minimum temperature is-2.4℃; ≥ 10℃ Accumulated temperature 6 1 1 1℃. The annual precipitation is 20 13.8mm and the frost-free period is 3 17 days. Spring: Beginning in mid-February, except in high altitude areas, the frost stopped and the temperature rose wave by wave. During the season, the prevailing wind direction gradually turns from north to south, and rainy days increase. Around the vernal equinox, when there is cold air crossing the border, there is a strong northeast wind for a short time, the temperature is lower than 12℃, and it is rainy. April and May are rainy seasons, with the temperature rising by more than 20℃ and rainy days increasing to more than 20 days. However, cold air still attacks the south from time to time. At this time, there is often a "cold in May" (lasting for 3 days, the temperature is ≤20℃). Summer: When the rainy season is over, the monthly average temperature rises above 25℃. Sometimes it reaches above 35℃ after July, and the weather is hot. The four seasons are mostly southeast wind or southwest wind, with frequent typhoons, local thunderstorms or typhoon storms, high temperature, more sunshine and large evaporation, which is a relatively dry and hot period in a year. Autumn: At this time, the summer monsoon turns into the winter monsoon, the temperature becomes lower, the rainfall is obviously reduced, and the weather is sunny and cool. In some years, the subtropical high pressure is strong, and a small cold air is not easy to go south, forming "autumn tiger" weather. In late September, strong cold air crossed the border, causing "autumn cold" (temperature ≤20℃). 1 1 month later, the first frost has been seen in the inland mountainous areas. Winter: The temperature drops suddenly and there are more and more frosts. There is freezing and snow in a few places inland, and it seldom rains. 65438+ 10 is the coldest month, and the average monthly temperature is below 10℃ in both mountainous areas and coastal areas.