Why are the louver boxes used for observing meteorology painted white?

The outer wall of the louver box is painted white, and the sunlight projected on the louver box will be reflected off by the white surface, and the air inside the box will not be baked very hot due to the heating of the box wall, and the measured temperature and humidity are more representative.

A louver box is a box for meteorological observation instruments, and there are various instruments such as temperature gauges, humidity gauges, and maximum and minimum temperature gauges. These instruments are used to measure the temperature and humidity of the free atmosphere in the shade, so it is desirable that the temperature and humidity inside the box will not be altered by the sun heating the walls of the box.

The darker the color, the more heat it absorbs from the sun's rays. If the louver box is painted black or dark, its temperature will rise rapidly under sunlight, so that the air temperature inside the box will increase, and the temperature we measure is not the temperature of the free atmosphere in the shade, but the temperature after being heated by the sun, so that the measured temperature is not representative.

White color maximizes heat reflection.

The louver box is equipped with a device to measure air temperature and humidity, and the air circulation inside and outside the box needs to be as exactly as possible with the temperature and humidity inside and outside.

Although the shutter box is surrounded by blades that facilitate air circulation, it is still possible to make the temperature inside the box higher than the outside temperature under the sun on a windless day. And the degree to which light and heat are absorbed and reflected by different colors is different. The darker the color, the easier it is to absorb heat, the lighter the color, the more it can reflect the heat in the sun's rays, and white is the lightest color, which can almost completely reflect the sun's rays.

Therefore, people paint the louver box white to ensure that the temperature inside and outside the box is as consistent as possible.

The louver box itself has no direct role in meteorological observation, and the louver box mainly plays the role of protecting internal sensors. The surface of the shutter box is coated with waterproof paint, because the shutter box is basically made of wood and fiberglass, and the waterproof paint applied on the surface plays a protective role. And white is also a color often used in the meteorological industry.

Now there are very few louver boxes in application, and when our unit purchased a weather station from Jinzhou Sunshine Meteorology many years ago, it began to use an integrated automatic weather station. The shutter boxes that are still used today are basically antique basic weather stations.

Other colors will affect sunlight absorption and affect temperature changes, so use white!

It is not that the louver box in the observation field of the weather station cannot be painted, but the outer surface must be kept white, usually painted with white paint. As we all know, white is the color with the greatest reflectivity of light radiation. Temperature and humidity sensors, temperature gauges, and automatic temperature and humidity recording instruments for meteorological detection are placed in shutter boxes high above the ground.

The louver box is used to install the protective equipment for temperature and humidity instruments (it is essentially a container, not a detection device), and its function is to prevent the detection equipment such as temperature gauge or temperature and humidity sensor from being irradiated by solar radiation to absorb heat and distort the detection data. The louver box is actually irradiated by solar radiation, and its exterior is painted white to reflect solar radiation to the greatest extent, and its material is generally glass fiber reinforced plastic or wood to ensure that it absorbs the lowest amount of solar radiation, so that the temperature detected by the instrument inside the louver box is closest to the atmospheric temperature outside the louver box (the error is negligible).

Because that blinder is actually also a temperature sensor, you think. After applying paint, of course, the sensitivity to the climate and temperature will fail.

The sense of climate and temperature will of course fail.