Because of the cold climate, cold fog, the weather is very cold at night, the temperature fell below 0-4 degrees Celsius. This range, which we have seen with solid Chin .
Partly because of the cold climate. The air is very cold at night. Temperature is lower than 0-4 degrees Celsius, this is where we're going to see a solid chin.
Because of the cold climate, the bright sky. The air is very cold at night, the temperature will be lower than 0 - 4 degrees Celsius. Which now we could see the water solid chin .