How is the climate in Shanghai different from that in Changsha?

Location Changsha City is located in the northeastern part of Hunan Province, on the lower reaches of the Xiangjiang River and the western edge of the Changliu Basin. Its geographical scope is 111°53′～114°15′ east longitude and 27°51′～28°41′ north latitude. It borders Yichun Prefecture and Pingxiang City in Jiangxi Province to the east, Zhuzhou and Xiangtan cities to the south, Loudi and Yiyang cities to the west, and Yueyang and Yiyang cities to the north. It is about 230 kilometers long from east to west and 88 kilometers wide from north to south. The city's land area is 11,819.5 square kilometers, of which the urban area is 556 square kilometers. Changsha City governs 5 districts: Furong, Tianxin, Yuelu, Kaifu and Yuhua, 3 counties of Changsha, Wangcheng, Ningxiang and Liuyang City. Climate Changsha has a humid subtropical monsoon climate. The climate characteristics are: mild climate, abundant precipitation, rain and heat in the same period, and four distinct seasons. The annual average temperature in the urban area of ??Changsha is 17.2°C, and in each county it is 16.8°C-17.3°C. The annual accumulated temperature is 5457°C. The average annual precipitation in the urban area is 1361.6 mm, and the average annual precipitation in each county is 1358.6-1552.5 mm. Changsha has long summer and winter, and short spring and autumn. Summer is about 118-127 days, winter is 117-122 days, spring is 61-64 days, and autumn is 59-69 days. The temperature changes greatly in spring, with more rain in early summer, high temperatures in late autumn, and less severe cold in winter. From late March to mid-May, warm and cold air mix with each other, resulting in continuous rain, low temperature and little sunshine. Starting from late May, the temperature increases significantly. There are 85 days with average daily temperature above 30℃ in summer. There are about 30 hot days with temperature above 35℃ on average per year. Midsummer is extremely hot with little rain. After late September, the days are warmer and the nights become cooler, with less precipitation and more days with low cloud cover. From late November to mid-March of the next year, during the winter season, the cold period with average temperatures below 0℃ in Changsha is very short. January is the coldest month in the year, with a monthly average of 4.4℃-5.1℃. Overwintering crops can Overwinter safely and grow slowly.