Meishan climate factors?

Climatic characteristics of Meishan city

Meishan city is criss-crossed, with rolling mountains. The terrain is high in the west and low in the east, with the highest elevation of 3522 meters and the lowest elevation of 335 meters. Natural conditions are complicated. The sea-land monsoon changes alternately every year, controlled by the subtropical high in the western Pacific in summer, influenced by the cold air in northwest China and Mongolia in winter, and the annual variation of solar radiation forms many climate types in this area.

1. The humid climate in the middle subtropical zone in Pingba hilly area is obvious.

Mild climate, abundant rainfall, four distinct seasons, rain in the same season; There is no cold in winter and no heat in summer; Long frost-free period, less frost and snow; Less sunshine; The time distribution of light, heat and water is synchronous with the growth and development period of crops, with good climate suitability, long growth period, large planting degree and rich yield.

1. Due to the influence of topography and landforms, the annual average temperature tends to be higher in the east and lower in the west. The average temperature in Renshou County is 17.4℃, which is the highest in the city. The annual average temperature in Shan Ling is 16.6℃, which is the lowest in the city. The hottest months are July and August, with an average temperature of 25.4-26.3℃ and an extreme maximum temperature of 38.6℃. The highest temperature in Leng Yue is 65438+ 10 month, and the average temperature is 6.2-6. The annual frost-free period is 302-3 14 days.

2. Abundant rainfall with uneven distribution in time and space. Rainfall increases from northeast to southwest according to different regions. The average annual rainfall is 983- 1490MM, the minimum annual rainfall in Pengshan is 983MM, and the maximum rainfall in Hongya is1490 mm. May-September is the concentrated rainfall period, and its rainfall accounts for about 85% of the total annual rainfall (the maximum daily rainfall is 1996).

3. Sunshine Sunshine hours are 1060- 1202 hours, which is 24-28% of sunshine hours, which is less than that in the same latitude area, and it is one of the low sunshine areas in China.

Second, the three-dimensional climate in the southwest mountainous area is obvious.

With the elevation rising in the southwest mountainous area, a complete climate zone spectrum from sub-potential zone-warm temperate zone-cold temperate zone-sub-cold zone appeared. The vertical difference of climate (stereoscopic climate) is obvious. The temperature decreases with the elevation, and the temperature decreases by 0.66℃ for every increase of 100 m. Rainfall increases with altitude; It has the climate concept of higher altitude, lower temperature and more rainfall.

Third, there are many kinds of meteorological disasters with high frequency.

1, due to the influence of monsoon, topography and landform, the drought occurred frequently in Renshou County, Dongpo District and pengshan county, causing great harm. According to statistics, the frequencies of spring drought, summer drought, summer drought and winter drought in three counties (districts) are 54.3-75%, 76.2- 100%, 19-54.3% and 22.9-31.8 respectively. Drought not only reduces food, makes drinking water difficult for people and animals, but also affects social stability. From1July 1997 to1April 1998, Renshou County experienced five droughts, including summer drought, autumn drought, winter drought and summer drought, which lasted nearly 290 days. Rivers cut off, wells dried up and the land cracked, resulting in 75 million kilograms of grain loss and 76,700 people lacking food due to disasters.

2. Rainstorms and floods are mainly caused by local rainstorms and transit floods. During the flood season (May-September), there are 3-5 rainstorm weather processes in all districts (counties) of the city. The rainfall time is concentrated, the intensity is large, and the momentum is fierce, which is easy to cause heavy losses. According to statistics, the annual average frequency of flood is 76.5%- 173.5%.

3. Wind and hail disasters mostly occur in the process of strong convective weather in spring and summer. Thunderstorms, strong winds and hail often occur at the same time. It will not only cause a devastating blow to crops, but also cause great losses to people's lives and property. 1At 8: 50pm on April 28th, 1997, 9 towns and villages in 5 districts of Renshou County were hit by gale and hail, with the maximum diameter of 9CM, resulting in loss of 2125,000 Jin of grain, damage to houses 1580 rooms, 3 deaths, 3 serious injuries and death of large livestock1. In addition, the low temperature in spring, the drizzle in autumn, and landslides, pests and diseases, forest fires caused by meteorological factors also have different degrees of impact on the city.