What is the weather like from 7 to 14 Dec. 2016 in Taiwan? What clothes to wear?

It will be cloudy in most time; light rain may happen from time to time, but it won't last for a whole day. Generally, it is during the best traveling season, with the average temp of 65-68F. You will feel comfortable. For attire, bring long sleeves and jacket as well as simple rain gear. If it rains, the mountains may be a little slippery, avoid letting the senior and kid to climb then.