I am planning to visit Taiwan on 30th Jan - 5th Feb 2017 which is also in Chinese New Year week.

At present, it is certainly too early to predict the weather for the next Spring Festival, but according to the records, it is during the best timing for travel, either the south or north part of that region. The average temp shall be around 16C. It will have cloudy days and showers. Generally, you can have fun well. During the festival, the malls and night markets are open, with only some stores in the night market closed.

Thank you Shun for your useful information.