The geographical environment of xiushui county

Xiushui county is a subtropical humid monsoon climate zone with four distinct seasons, abundant heat, long frost-free period, abundant sunshine and rainfall. The climate varies greatly from place to place, and the stereoscopic climate is obvious. Annual average temperature 16.7℃, annual precipitation 1634. 1mm, annual sunshine 1600.4 hours.

The climate characteristics of each season are: the cold and warm air meet frequently in spring, and the temperature changes greatly. The invasion of cold air often causes rainy weather, which is not conducive to spring sowing. It is also often due to the strong warm and humid airflow and its strong convection activities, resulting in disastrous weather processes such as local heavy rain, strong wind, strong lightning and hail. The flood season begins in April. In the intersection of cold and warm air in early summer, the vortex often moves eastward in the southwest, which leads to continuous rainfall and heavy rain and floods. After the rainy season, the subtropical high in the Pacific Ocean strengthened the control of the local area, and xiushui county entered the midsummer, with extremely hot weather and little rain, and frequent high temperature and dry weather. In early autumn, xiushui county changed from summer monsoon to winter monsoon, and cold air often invaded to produce autumn cold, which was called cold dew wind, and affected the growth of crops in autumn, especially the full heading the next night. Late autumn is controlled by denatured high pressure, with crisp air in autumn, less wind and rain and more sunshine, which is conducive to autumn harvest and winter planting. But autumn drought often happens. Winter is cold, with little rain and dryness, and the north wind prevails, which often leads to the process of cooling, snowfall and freezing weather due to the invasion of strong cold air (cold wave). Although it is warmer in winter, the extreme minimum temperature will drop below minus 5 degrees. sunlight

The average sunshine hours in xiushui county for many years are 1629 hours, and the sunshine percentage is 38%. The sunshine hours above 10℃ are 1254 hours, with an average of 5.6 hours per day, accounting for 76% of the annual sunshine hours.

temperature

The annual average temperature in xiushui county is 13- 17℃. The hottest month is July, with an average monthly temperature of 27-28℃. The most Leng Yue is 65438+ 10 month, and the monthly average temperature is 3-4℃. The annual average temperature is 24-25℃. The extreme maximum temperature is 44.9℃ (appearing on August 1953 15). The extreme minimum temperature is-1 1.6℃ (appearing on 1967 65438+ 10/6 and1972 February 9). The first frost usually appears in the middle of June 165438+ 10, the earliest is June 24th, and the latest is June 65438+February 65438+May. The final frost usually appears in the middle of March, the earliest is February 15, and the latest is April 8. The average annual frost-free period is 247 days, with the longest 289 days and the shortest 223 days.

deposit

The average annual precipitation in xiushui county exceeds1500mm. Seasonal distribution of rainfall is uneven. Rainfall is concentrated in April-June, with an average of 700-800 mm for many years, accounting for 47% of the whole year. In February, 10- 190 mm accounts for 10% of the whole year. The annual rainfall varies greatly, with the maximum of 1954 2296 mm and the minimum of 1968 only1088 mm.