Freezing point of water

On a weather forecast temperatures are given in degrees Celsius. Sometimes temperatures are called degrees centigrade, which is the same scale.
You can use a short hand for writing temperatures. You use the degree sign ° and C for Celsius. For example you write the temperature 8 degrees Celsius as 8°C.
When water turns to ice it freezes. The temperature water freezes at is zero degrees Celcius, that's 0°C. Here are some other common temperatures:

Below and above freezing

Negative temperatures are called below freezing and positive temperatures are above freezing.

On the weather map it shows that:
In Newcastle it is 1 which is 1 degree Celsius, 1°C

• 1 degree above freezing

In Glasgow it is -4 which is negative 4 degrees Celsius, -4°C

• 4 degrees below freezing

So on this map it's colder in Glasgow than in Newcastle.