Haikou, Hainan Province, Hangzhou, Zhejiang Province and Harbin, Heilongjiang Province, where are the four seasons unclear?

It is Haikou, Hainan. Here is a brief introduction to climate comparison for reference.

Haikou City is located in the tropical coastal area, with diverse tropical resources and rich natural scenery in Yu Haibin. Haikou is located in the northern edge of the low-latitude tropical zone and belongs to the tropical maritime climate. Spring is warm, less rain and more drought, summer is hot and rainy, autumn is typhoon and rainstorm, and winter is cold shower. The sunshine time is long all year round, and the radiation energy is large. The annual average sunshine hours are more than 2000 hours, and the solar radiation can reach 1 1 to 120000 kcal. The annual average temperature is 23.8℃, the highest average temperature is about 28℃, the lowest average temperature is about 18℃, the annual average precipitation is about 1664 mm, the daily average rainfall is above 0. 1 mm, and the rainy day is above 150 days. The annual average evaporation is 1834 mm and the average relative humidity is 85%. The northeast wind and easterly wind predominate throughout the year, with an annual average wind speed of 3.4m/s.

Hangzhou City, Zhejiang Province

Located in the southern wing of the Yangtze River Delta, the western end of Hangzhou Bay, the lower reaches of Qiantang River and the southern end of the Beijing-Hangzhou Grand Canal, it is an important central city in the Yangtze River Delta and a transportation hub in southeastern China. The geographical coordinates of Hangzhou urban area are 3016' north latitude and12012' east longitude. The northwest and southwest of Hangzhou are in the hilly area of western Zhejiang; The northeast and southeast are located in the northern plain of Zhejiang Province, with dense river networks, which is a part of the famous land of fish and rice. Hills and mountains account for 65.6% of the total area, plains account for 26.4%, rivers, lakes, swings and reservoirs account for 8%. Hangzhou has a subtropical monsoon climate with four distinct seasons, mild and humid, abundant sunshine and rainfall. Annual average temperature 16.2℃, summer average temperature 28.6℃, winter average temperature 3.8℃. The frost-free period is 230-260 days. The annual average rainfall is 1435mm, and the average relative humidity is 76%.

Climatic causes of Harbin city, Heilongjiang province

Harbin is located in the middle and high latitudes in the east of the Eurasian continent, with 44 04 ′ ~ 46 40 ′ north latitude and 65 438+025 465 438+0 ′ east longitude.

Between ~ 130 13', Songnen plain in the west and southwest, Xiaoxing 'anling in the north and northeast, and Xiaoxing 'anling in the east and east.

To the south is Zhangguang Cailing of Changbai Mountain System. According to the climate zone of China, the climate of Harbin belongs to the mid-temperate continental climate.

Monsoon climate. Influenced by the monsoon circulation system in the polar front convergence area, it has obvious monsoon characteristics, and the winter monsoon is stronger than the summer monsoon.

And it comes early, but the summer monsoon comes late. Winter wind comes from high latitude inland, controlled by polar continental air mass, which is cold and dry, with frequent cold waves and long winter; It is warm and rainy in summer due to the influence of tropical ocean air mass. When winter and summer monsoon alternate, summer monsoon

It develops gradually from south to north, and the summer monsoon reaches its peak from late July to early August, which is the most concentrated period of rainfall in Harbin.

From mid-August to early September, the summer monsoon gradually recedes, that is, it ends from north to south. Monsoon climate produces obvious seasonal winds,

The prevailing wind direction changes alternately. West wind or north wind prevails in winter and south wind or southeast wind prevails in summer. Spring and autumn are shorter,

South wind and north wind alternate.

Climatic characteristics

Harbin's climate is characterized by four distinct seasons, long and cold winters, short and hot summers, and spring and autumn temperatures.

The fluctuation changes quickly, which belongs to the transitional season and the time is short. Affected by geographical environment, land and sea air masses and monsoon alternation, all

The climate of this city changes greatly in different seasons. Winter is controlled by the polar continental air mass, and the climate is cold and dry; The pain of summer

Subtropical marine air mass with abundant rainfall and warm climate; Spring and autumn are influenced by alternating winter and summer monsoon and climate.

Changeable, windy in spring, less precipitation, prone to drought; In autumn, the temperature drops suddenly, and there are often frost hazards.

Spring climate

Spring (March-May) is the transitional season between winter and summer, with rapid temperature rise, less precipitation, strong wind, dry air and changeable weather.

The temperature fluctuates greatly. The temperature changes sharply from month to month, generally around 8 ~ 10℃. The average annual temperature in spring in this city is 5.65438 0℃.

The low temperature centers are Shangzhi, Yanshou and Tonghe, and the average temperature in spring over the years is below 4.4℃. The high temperature center is in Shuangcheng, Acheng and

The average temperature in spring in Binxian County over the years is greater than 5.6℃. The city's average annual precipitation in spring is 80.2 mm, and the dry year is

39.0mm (1989), and the wet year is 127.9mm (1976). There is more precipitation in the south and east in spring, which is easy to happen.

Spring waterlogging; There are few in the west, which is prone to spring drought. The maximum wind speed is in spring, and it is 22 ~ 37m/s from April to May. Over the years,

The maximum wind speed is 37m/s (Acheng1May 3, 974); The average number of windy days is 25, and the maximum number of windy days in Yilan is 63.

Jesus Christ. The final frost varies greatly among counties in the city, with an average of 10 in May over the years. Shuangcheng, Acheng and Binxian are May 5th. P5，

Founder and Yilan in early May; Bayan, Mulan, Tonghe and Yanshou are in mid-May; Only Shangzhi was in late May and early May. end

The annual frost range is large, sometimes about 10 days earlier or later than normal. Delaying the final frost will cause late frost, which is also agriculture.

Major disaster in production.

Summer climate

In summer (June-August), the climate is warm, the rainfall is abundant, and the light and hot water are in the same season, which is beneficial to agricultural production. Average annual gas consumption in urban summer

The temperature is 20.8℃, and the variation range is19.4-22.4℃; The lowest value 19.4℃ appears at 1983, and the highest value appears at 22.4℃.

At 1994. Although the average temperature in summer changes very little, the difference is only 3℃, but it has a great impact on agriculture. summer

The temperature is high in the west and low in the east. July is the month with the highest temperature in the whole year, with an average temperature of 22.3℃ over the years. Among them, Shangzhi

, Yanshou, Tonghe and Yilan below 22℃. The monthly temperature difference is very small, generally only 2-3℃, which is the smallest in all seasons. Summer decline

The city's annual average water volume is 379 mm; The range of changes over the years is 197.5 ~ 633.7mm, with a difference of more than 2 times. season

The average annual precipitation in Shangzhi, Wuchang and Bayan is over 400 mm. The intensity of precipitation is not great, and the average number of rainstorm days is 1 ~ 2 days.

Heavy rain is rare. Generally, heavy rain mostly occurs in the eastern mountainous and hilly areas, which is easy to cause flash floods or floods.

Autumn climate

Autumn (September ~ 65438+1October) is the transition season from summer to winter. Due to the influence of cold air in the north, the climate changed from warm to cold. Cyclone activity

Near spring, the weather is changeable, and the temperature drops sharply after the cold front. The monthly variation range of temperature is 8 ~ 9℃

. The average seasonal temperature in this city over the years is 9.4℃; The interannual variation range is 7.9 ~ 1 1. 1℃, with little change. Chu Shuangquan

The average year is September 23; It first appeared on September 7th (Shangzhi, Yanshou 1976). Because frost is greatly influenced by topography,

This has caused the difference of the first frost date between the plain and the mountainous area. After autumn, the precipitation decreased obviously, but it was more than that in spring. The whole city

The average precipitation over the years is 94.3 mm; The interannual variation is between 46.2 ~ 167. 1 mm; Stick to your ambition and prolong your life.

Fangzheng and Tonghe are greater than100 mm. The wind speed in autumn is higher than that in spring, and the wind direction is mainly southerly.

Winter climate

Winter (1 1 ~ February of the following year) is controlled by dry and cold polar continental air mass, with low temperature, little precipitation and cold and dry climate.

Dry. The average temperature in winter is-14.2℃. 65438+ 10 is the coldest month, and the average temperature of the whole city over the years is-19.6℃. The whole city in winter

The average annual precipitation (snow) is 23.6 mm; The interannual variation is between 6.6 and 35.4 mm, with a difference of nearly 5 times. winter

Southwest winds prevail in urban areas, and the wind speed is very small. Sometimes there will be snowstorms.

Climatic extreme value

The annual average maximum temperature in Harbin is 5.9℃( 1990 Binxian), and the annual average minimum temperature is 0.7℃( 1969).

County). The daily extreme maximum temperature is 37.8℃ (now 65438+ in Yilan County on July 8, 0982), and the daily extreme minimum temperature is -42.6.

℃( 1970 1.4 now Yanshou county). Annual extreme maximum precipitation 108 1.3mm (Shangzhi 1960)

City), the annual extreme minimum precipitation is 247 mm (Shuangcheng 1989). The annual extreme maximum precipitation days reach 159.

Days (shangzhi city 1957), the annual extreme minimum precipitation days are only 80 days (two cities 1962). Rizui

Heavy precipitation 1 68.3mm (1August, 9601Bayan county today). The extreme maximum wind speed is 37.0m/s (1974 5

Sunrise on March 3, now Acheng).