What's the weather like in Changsha from March to July? What are its characteristics?

Hehe, I'm from Changsha, and I'm glad to answer your question!

The climate in Changsha is actually not very good, but it is definitely characterized by four distinct seasons. Like spring now, every day is spring rain, which is very humid. The sky always looks gloomy. Summer will be surprisingly hot for a period of time, about 40 degrees. Staying in an air-conditioned room is the most comfortable. In previous years, the summer heat in Changsha killed people. Autumn is the most comfortable season throughout the year, with fresh air and breezy breezes. It is a poetic season, but autumn in Changsha is relatively dry. Although the temperature in winter is not as high as that in the north, the winter in Changsha is cold and windy, like a knife cutting on the face.

Changsha has a subtropical monsoon climate with four distinct seasons. It is rainy in late spring and early summer, and dry in late summer and early autumn; Spring is wet and changeable, summer and autumn are sunny, winter is short and summer is hot. The annual frost-free period is about 275 days, and the annual average temperature is 16.8 ~ 17.2℃, the extreme maximum temperature is 40.6℃, and the extreme minimum temperature is-12℃. The annual average total precipitation is 1422.4 mm.

Changsha's climate is characterized by mild climate, abundant precipitation, simultaneous rain and heat, and distinct seasons. The annual average temperature in Changsha is 17.2℃, the annual accumulated temperature in each county is 5457℃, the annual average precipitation in urban area is 136 1.6 mm, and the annual average precipitation in each county is 1358.6 ~ 65438. Changsha is long in summer and short in spring and autumn, with about 1 18- 127 days in summer, 1 17- 122 days in winter and 6 1-64 days in spring. The temperature changes greatly in spring, with more rain in early summer, long high temperature in summer and autumn and less cold in winter. From late March to mid-May, cold and warm air crossed each other, forming continuous rainy and low temperature weather. Since the end of May, the temperature has obviously increased. In summer, the average daily temperature is above 30℃ for 85 days, and in hot days above 35℃, the average annual temperature is about 30 days, and it is very hot and rainy in summer. After the end of September, it is warmer during the day and cooler at night, with less precipitation and more low clouds. 165438+ 1 from late October to mid-March of the following year, the severe cold period in Changsha is very short, and1is the coldest in June, with a monthly average of 4.4℃-5. 1℃. Overwintering crops can safely overwinter and grow slowly.

To put it simply, Changsha is located in the Xiangjiang River Valley, with high humidity, thick smoke in summer (the humidity is generally above 80%, and it is close to 90% before it rains, which feels like a sauna), and it is bitterly cold in winter (the wind is particularly strong outside, and there is no heating in the house), while the time in spring and autumn is very short, and the temperature changes greatly. Sometimes sunny days are summer, and rainy nights become winter.

Changsha's climate features are: Leng Xia is hot in winter, with four distinct seasons; Spring and autumn are short, winter and summer are long, which fully embodies the similarities and differences of subtropical continental monsoon climate types.

Spring: The first climate feature is that the temperature rises rapidly and changes greatly. "Three points of water and heat in spring" is a well-known proverb in Changsha. From the average temperature of 10℃ in March to 22℃ in May, it rose by 12℃ in just two months, with an average monthly increase of 6-7℃. At the same time, the temperature not only rises rapidly, but also changes greatly. For example, the temperature in April, according to the statistics of 30 years, the lowest monthly average temperature is 13.6℃, and the highest is 2 1. 1℃, with a difference of nearly 8℃. Another example is 1969. On April 5th, the lowest temperature was 2.5℃, while on April 5th 10 of the same year, the highest temperature was 33.4℃, and the five-day temperature difference exceeded 30 degrees. Therefore, "chilly spring" is a common phenomenon in Changsha. Rapid temperature rise is beneficial to crop sowing, but large temperature difference brings adverse effects.

The second feature of spring in Changsha is continuous rain and humid air. The average rainy days in Changsha from March to May (the daily rainfall is equal to or greater than 0. 1mm) are 52.8 days, accounting for more than 35% of the total rainy days in a year (15 1.2 days). It rains continuously for many years 15-20 days, so the precipitation from March to May accounts for the whole year. The cloudy days in these three months (the daily average total cloud amount is more than 80%) account for more than 365,438+0% of the total cloudy days in the whole year, and the relative humidity is between 83% and 84%, which is the season with the highest relative temperature in the whole year. In a word, Changsha's spring rain is famous all over the country.

Summer: Changsha is famous for its long summer, which lasts for four and a half months and is the longest season in the whole year. It is also the highest temperature season in the whole year. From June to September, the ten-day average temperature is 25℃, and from late July to late August, the ten-day average temperature is above 29℃. According to records, the highest temperature measured at Tianxin Park observation field of Changsha Customs Meteorological Station on August 1934 is 43℃, which is the high temperature limit of Changsha. The highest temperature since 1949 is 40.6℃, which was measured on 1953 in August. This kind of situation is rare in China. The average daily temperature in Changsha is above 30℃ for 94 days, including 84 days in summer, and the average daily temperature is above 35℃ for as many as 1 month, mainly in August. Because Changsha is located in the Xiangjiang River Basin, with low terrain and relatively high temperature, it is steaming in the heat, so Changsha, Chongqing, Wuhan and Nanjing are also called the four furnaces in Changsha Basin.

Another feature of Changsha in summer is uneven precipitation and uncertain droughts and floods. The rainstorm days in Changsha are mostly concentrated in May, June and July. During the 30 years from 195 1 to 1980, there was a total of 1 10 days in Changsha, of which May 23rd, June 29th and July 20th accounted for 65% of the total rainstorm. However, rainfall varies greatly from year to year. For example, the total average rainfall in late June was 69.8 mm, but 1969 was as high as 384.8 mm, and 1975 did not rain. For another example, the precipitation in early July was 4 1.4 mm, but it was 226.7 mm in 1.965, and there was no rain for five years. The result of uneven precipitation is bound to cause waterlogging or drought, but due to high temperature and abundant rainfall, summer in Changsha still provides favorable climatic conditions for crop growth.

Autumn: Changsha is characterized by less rain and crisp autumn. Autumn and winter are dry seasons in Changsha. According to statistics, from late September to1mid-October, the average precipitation was only 23.6 mm, less than one third of that in spring. There have been many years in history when it has not rained for nearly 40 days, and the characteristics of autumn dryness are very obvious. In addition, although autumn in Changsha is short, there are many sunny days. According to statistics, the average number of sunny days with low cloud cover less than 2 in Changsha is *** 136.2 days, while from September to 1 1.5 days, accounting for one third of the annual total. During this period, the temperature is also suitable, from hot summer to cool autumn, but the temperature is slightly higher than that in spring, so Changsha folks have the reputation of "October Spring". The "golden autumn season" in Changsha not only presents the picturesque beauty of "all mountains are red and all forests are dyed", but also presents the harvest weather of "frost dew steaming thousands of trees, waves surrounding the wind shaking a continent" and "jellyfish everywhere see Miao Shuo, hut every family refers to wheat autumn", which reproduces the mature beauty everywhere. What is lacking is that autumn leaves in a hurry and winter is bleak.

Winter: Changsha has no severe cold and little rainfall in winter. The average monthly temperature in winter is mostly above 5℃, and the coldest monthly average temperature is 10. 6℃, the highest is 8.6℃. Frost or freezing weather occurs when the temperature is lower than 0℃ in one day, and the average winter is only 19.9 days. Although extreme low temperature has occurred in rare cases, for example, the lowest temperature reached-1 1.3℃ on February 9 and1.5℃ on October 30. However, when the daily average temperature is -5℃, the annual average is only 1.3 days, and there is no severe cold period when the average temperature is less than 0℃. Although the winter precipitation in Changsha only accounts for 16% of the whole year, it is the month with the least precipitation in 65438+February, with an average monthly rainfall of 45.3 mm, which is more than that in Nanjing in the lower reaches of the Yangtze River (29.4 mm) and Guangzhou in the Pearl River Delta (24.7 mm), which is enough for the growth of overwintering crops.