I moved here last December. January wasn't bad at all. However, CNY is early in 2016 (February 8th). There's a 40 day travel period surrounding this time. Honestly, you'd be best off coming after the Lantern Festival which marks the end of the CNY holiday. That would mean after the 22nd of February. At any time in those 40 days, travel can be difficult because so many people are moving about the country.