What is the food like in Jiangsu?

Jiangsu is famous for her "Huaiyang" Cuisine, which is an important part in Chinese government banquet for foreigner leaders. Mainly speaking, the food in south Jiangsu is mild but a pretty salty in the north as it is closer to Shandong Province.

Will it snow a lot in Jiangsu?

Not really. Especially in the south.

How long and how much it will take by train from Shanghai to Nanjing?

You may take a G train. It will cost you 1 hour and 20 mins, about 140 RMB yuan.