Traditional Culture Encyclopedia - Weather forecast - What is the weather degree based on?

What is the weather degree based on?

The degree of weather is measured in degrees Celsius, that is, pure water freezes at 0 degrees at one atmospheric pressure and boils at 100 degrees.

The benchmark for measuring the ground temperature is measured in a wide area, about 1.5 meters above the ground, without the influence of solar radiation (in the shutters), and the ventilation volume is 2-3 meters per second.