Geographical environment of Xuanhua District

The rivers along the Yanghe River in Xuanhua belong to warm temperate zone, and the climate belongs to semi-arid continental monsoon climate. Spring is affected by strong cold air, with changeable weather, less precipitation and more windy days; In summer, due to the Pacific subtropical high extending westward and lifting northward, the air is humid, and the water drops more under the control of warm and humid air flow. In autumn, the warm and humid southeast airflow gradually weakens, the dry and cold northwest airflow strengthens again, the temperature drops rapidly, the weather is fine, and the rain is decreasing day by day; Winter is controlled by the powerful Mongolian cold high pressure, which is cold and has little snow. Strong cold air often forms a cold wave when it goes south, resulting in severe cooling and windy weather.

temperature

Xuanhua District is located on the north bank of Yanghe River, with an annual average temperature of about 8℃.. 1 month, which is the coldest month in the whole year, with a monthly average temperature of-10.9℃ and a monthly average minimum temperature of-16℃ ... July is the warmest month in a year, with a monthly average temperature of 23.3℃ and a monthly average maximum temperature of 29-30℃.

Since liberation, the extreme maximum temperature in Xuanhua District has appeared in June 1968+00, which is 39.1℃; ; In the same year, the lowest temperature was -2 1.9℃, annual range was 6 1.0℃, and the extreme lowest temperature appeared at1February 8, 973, which was -25.8℃. In the same year, the highest temperature was 33.9℃ and annual range was 59.7℃.

sunlight

Xuanhua enjoys abundant sunshine, with the annual sunshine hours 197 1 averaging 2870 hours in 2005, accounting for 6 1% of the available sunshine hours, of which the sunshine hours at 0℃ are more than 2006 hours 1483 hours. From April to September, during the crop growing season, the average monthly sunshine hours are more than 250 hours. The maximum sunshine hours in 1980 were 3 193.8 hours, and the minimum sunshine hours in 2003 were 210/0.2 hours. According to the meteorological records of Xuanhua 197 1 to 1990, the annual average sunshine hours are 2906 hours; From 199 1 to 2005, the annual average sunshine hours were 2700 hours, which was 206 hours less than that in 2005.

deposit

Mainly refers to rainfall, followed by snowfall. Xuanhua is controlled by northwest airflow in winter and spring, with more wind, less rain and snow; Summer and early autumn are controlled by the warm and humid air flow in the southerly ocean, and there is more rain. From 1960 to 2005, the average annual precipitation was 361.7mm .. 1973, and the maximum precipitation was 563.9mm.: 1999 has the smallest precipitation of 226.3mm. ..