How hot is it?
If you want to know how hot the weather is today you can use a thermometer. A thermometer is an instrument that measures the temperature.
It looks like this:
Do you recognise it? Doctors use thermometers to measure the temperature of their patients.
If you look at a thermometer you will see this sign °C. This stands for degrees Celsius.
The hotter the weather is, the more degrees Celsius will show up on the thermometer.
When the temperature is below 0 degrees Celsius (°C), it is very cold. There can be ice and snow. Temperatures below zero are shown with a negative number. For example, -20°C means it is 20 degrees below zero.