Why is the first snow in Hangzhou always in Lin 'an?
1. Location: Lin 'an is located in the northwest of Hangzhou. Generally speaking, cold air is from north to south. Lin 'an can be exposed to cold air earlier, and the temperature drop is the most obvious. In winter, the water vapor flows from west to east, and Lin 'an can get in touch with water vapor earlier. In terms of water vapor and temperature, Lin 'an is the first in Hangzhou to meet the snowfall conditions.
2. Altitude factor: There is Liang Qingfeng, the highest peak in Hang Cheng, in Lin 'an, with an altitude of 1, 787.4m.. Relatively speaking, the higher the altitude, the lower the temperature. In the troposphere, the temperature drops by about 0.6℃ for every elevation increase of 100 meters. Hangzhou altitude 19 meters. According to the temperature formula, the height difference between Hangzhou Plain and Liang Qingfeng is greater than1700m, and the temperature difference is greater than 10℃. In terms of temperature difference, Lin 'an high-altitude mountainous area is the first to meet the snowfall conditions in Hangzhou.
Climate in Lin' an area
Lin 'an District is located in the northwest of Zhejiang Province, at the southern edge of subtropical monsoon climate zone, with warm and humid climate, abundant sunshine and rainfall, and distinct four seasons. The average annual precipitation 16 13.9 mm, the number of precipitation days 158 days, and the average frost-free period is 237 days, which is affected by severe weather such as typhoon, cold wave and hail.
Affected by the terrain (Lin 'an District is dominated by hills and mountains, and the terrain inclines from west to east to south), the local three-dimensional climate is obvious. From Jincheng, which is less than 50 meters above sea level, to the top of Tianmu Mountain, which is at an altitude of 1500 meters, the annual average temperature drops from 16℃ to 9℃, with an annual temperature difference of 7℃, spanning two climatic zones: subtropical zone and temperate zone.
Reference to the above content: Baidu Encyclopedia-Lin 'an District