In the permanent section about professional devices, we will tell you about the Meteorological (psychrometric) booth

Air temperature measurement is probably the most accessible meteorological observation for people who are not related to meteorology. What could be easier than buying a thermometer in a store and attaching it to a window or other suitable items. And here you are, going for a walk, look at the temperature, dress appropriately, but when you go outside, you realize that the weather is warmer or colder than you expected. What's the problem?
And the fact is that the thermometer attached to the window shows not quite the correct temperature. The values of the thermometer are influenced by factors such as solar radiation, wind speed, precipitation, and the object to which the device is attached.
At weather stations, the "true temperature" is measured. To do this, it is necessary to exclude or minimize the influence of the above factors. For this purpose, the observations use an installation called a "protective louver booth for the installation of meteorological instruments". Other names: meteorological booth, psychrometric booth, Selyaninov booth (in honor of the Russian climatologist).
To further exclude the influence of sunlight, the psychrometric booth on the inside and outside should be well painted with white oil paint. In this case, the booth (and the air inside it) will not be very hot (it will reflect the sun's rays).
It is fixed on a special stand with a height of 175 cm so that the floor is strictly horizontal. The weather booth with a stand is oriented on the platform so that the door is facing north; on the north side of the stand, a ladder with a lattice platform for the observer is installed. The ladder should not touch the stand. The stand and ladder, as well as the psychrometric booth, must be painted with white oil paint.
Inside the psychrometric booth there are 4 thermometers: two of them are located vertically - dry and wet (TM-4), two - horizontally - maximum (TM-1) and minimum (TM-2). In addition, there is also a device for measuring relative humidity-a hygrometer.
Thus, unlike household thermometers, which show an inflated or underestimated temperature, thermometers in a weather booth show the "true" temperature, not distorted by any environmental factors.