Natural conditions in Dalian

Dalian has a warm temperate and semi-humid monsoon climate with maritime climate characteristics. This area is located in the mid-latitude zone of the northern hemisphere, and the solar radiation is relatively large all year round. The atmospheric circulation is dominated by westerlies and subtropical systems. In addition, influenced by the geographical environment with mountains on one side and sea on three sides, the climate in this area is characterized by four distinct seasons, mild climate, humid air, concentrated precipitation, obvious monsoon and strong wind.

The annual average temperature is 8~ 1 1℃, which decreases from south to north, making it the warmest region in Northeast China. It is the hottest in August and the coldest in 65438+ 10.

The annual precipitation is 550 ~1000 mm, increasing from southwest to northeast. The precipitation center is located in the northern mountainous area of zhuanghe city. The distribution of precipitation is uneven in four seasons, and 60~70% of precipitation is concentrated in summer.

This area is within the East Asian monsoon, with southerly winds prevailing in summer and northerly winds prevailing in winter, with an average annual wind speed of 3 ~ 6m/s, which is one of the areas with relatively high wind speed in Northeast China.

Climate characteristics in spring: dry and little rain, quick recovery.

This season, warm air becomes active, cold air gradually weakens and the temperature rises rapidly. From the end of March to the beginning of April, it turned from snow to rain, and the seasonal precipitation was 75- 1 15mm, accounting for a little more than 10% of the annual precipitation. Due to less precipitation and large evaporation, it is easy to cause drought.

Summer climate characteristics: wet and rainy, high temperature.

The average temperature of each month in this season is above 19℃ in most areas, and August is the hottest. This season is rainy and rainy, with concentrated precipitation. Seasonal precipitation is 350~550 mm, accounting for 60~70% of the annual precipitation, and local floods and droughts are prone to occur in individual years. From mid-July to late August, there are 1~2 tropical cyclones every year on average, and the influence degree varies with the path and intensity of tropical cyclones.

Climatic characteristics in autumn: the cloud and rain suddenly decrease and the climate is cool.

This season, cold air activities began to strengthen, the strength of warm air weakened day by day, clouds and rain plummeted, and the temperature dropped. The expressions of "crisp autumn air" and "an autumn rain, a cold" are excellent descriptions of the autumn climate characteristics in this area.

Winter climate features: scarce rain and snow, dry and cold.

Under the long-term control of the cold air mass from the northeast, the air is dry and the temperature is low. 1 is the coldest month. There is little precipitation in this season, and the seasonal precipitation 19 ~ 29mm accounts for 5% of the annual precipitation. Snowfall above 10 mm is rare.

The annual average temperature is 10.5 degrees Celsius, the annual precipitation is 550-950 mm, and the total sunshine hours are 2500-2800 hours. The extreme maximum temperature in Dalian over the years is 35.3℃, and the lowest extreme temperature is -20. 1℃.