Why does the thermometer in winter show that the temperature is 10 degrees higher than the weather forecast?

In order to make the temperature around the world uniform and comparable, the standard monitoring of temperature needs to eliminate these influencing factors. According to the unified standard of the World Meteorological Organization, the thermometer of meteorological department should be placed in a white louver box on the open lawn, which is 1.5 meters above the ground.

The four walls of the louver box adopt glass fiber reinforced plastic shutters, which can not only prevent the influence of direct sunlight, ground reflection, strong wind and heavy rain, but also ensure air circulation, and can measure the real temperature of the atmosphere after eliminating interference.

This is why when the meteorological department measures 39℃, the outdoor temperature displayed by the car is higher than this value, because the observation height from the ground and the solar radiation are different.