Distribution of Climatic Zones in Heihe River

Heihe River is close to the Siberian prairie, the birthplace of cold air, and Xiaoxing 'anling Mountains run through the north and south, which makes the whole city have the characteristics of continental monsoon climate in cold temperate zone, spanning three, four, five and six accumulated temperature zones. Hot and windy in spring, rainy and hot in summer, sudden cooling in autumn, cold and dry in winter, long in winter and short in summer, with four distinct seasons. The city's annual average rainfall is 500-550mm, the effective accumulated temperature is 1950-2300℃, the sunshine hours are 2560-2700 hours, the frost-free period is 90- 120 days, the annual average temperature is-1.3-0.4℃, and the daily maximum temperature is 38. Cold is one of the main features of the climate in Heihe region, with an annual average temperature of-1.3-0.4℃. 1 month is the coldest, with an average temperature of -25.4-23.8℃. It is the hottest in July, with an average temperature of 19.4-2 1.3℃. The annual variation range is 44.2-46.7℃, which is rare in other parts of China. From mid-October of 65438/kloc-0 to mid-April of the following year, the days when the daily average temperature in the whole region is less than or equal to 0℃ are 183- 195 days; 165438+1from late October to the end of February of the following year, the daily average temperature is less than or equal to -20℃, which lasts for 88- 103 days. The average number of days in a year when the lowest temperature is less than or equal to -30℃ can reach 25-54 days, which can occur from the end of June 165438+ to March of the following year. The extreme minimum temperature in various places exceeds -40℃, which can occur in most years. In the winter of 1965, the lowest temperature is less than or equal to -30℃ for 9 1 day and less than or equal to -40℃ for 20 days. The extreme minimum temperature of -48. 1℃ also appeared in the winter of 1980. The climate in Heihe region is pleasant in summer, hot at noon and cool in the morning and evening. From late May to late August, the number of days when the daily average temperature is greater than or equal to 20℃ exceeds 80 days. The number of days when the annual average maximum temperature is greater than or equal to 30℃ is 7- 12 days. The highest temperature recorded in Dedu County1July 1968 was 38.2℃. From mid-May to mid-September, the average daily temperature in the whole region remained above 10℃, with at least 1 16 days in Sunwu County and 123- 128 days in other counties (cities). The accumulated temperature greater than or equal to 10℃ is between1944℃ and 2306℃, with Sunwu County being the least. It is characterized by the lowest temperature and the smallest accumulated temperature in the hinterland of Xiaoxing 'anling. Extending to both sides of the mountain range, the temperature gradually increases and the accumulated temperature gradually increases.