What is the lowest temperature in Shantou, Guangdong?

I remember that on New Year's Day, the school held a celebration dinner. At that time, the clothes were wrapped in three layers outside, because the principal sent a notice, and the lowest temperature at that time was just zero degrees Celsius. The next day, Shantou news also reported that it was the lowest temperature since I lived in Shantou for so long. At that time, it felt like one word, frozen. ...

Except during that time, the lowest temperature in Shantou is rarely zero degrees Celsius or below, and it is usually around 5-8 degrees Celsius, which is quite cold.