Warnhinweis vom Hong Kong Observatory:

As Hong Kong is being affected by a cold winter monsoon, people are advised to put on warm clothes and be aware of low body temperature due to the cold weather.

If you must go out, please avoid prolonged exposure to wintry winds.

... wenn es kalt ist, friert man. 10 C sind winterliche Temperaturen und vergesst das Atmen nicht! ;-)

Update: Dafür ist es hier zu warm.