This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. Get faster notifications on the latest updates by downloading our app. Hongkongers woke up to a cold Christmas Day, but the weather is expected to get even colder on Boxing Day, with temperatures set to drop further to 13 degrees Celsius (55.4 Fahrenheit). The Hong Kong Observatory said on Thursday that the city was “appreciably cooler” under the influence of...