December is good if you want to experience typhoon weather.

Of course. I experienced it in 2014.
Actually it is not that bad. Strong winds and rain. Most dangerous is the falling branches. Me and the missus purposely walked out onto TST at midnight to see how it was but since we were smack inside HK city, the winds were somewhat blocked off from the many tall buildings. In fact a lot of HK people were out then and there should be tons of photos and news of it in the papers.
I travel to HK at least 3X a year. First time experiencing a typhoon though. And that's why I don't go to HK in December.

ugh.. just bought my ticket to HK this dec during christmas. got to pray