I'm planning to travel china this coming march 15-27 2013, its still cold out there?

It depends. If you plan to visit the north area of China, it will still be cold then. For example, during that time, Beijing willl hold an average temperature of about 8C, so you need wear a thin sweater plus a light windproof jacket. While for the cities of southern China, it can be appropriate to travel with mild sunshine and pleasant temperature.