What does meteorological conditions mean?

Meteorological conditions refer to the hydrothermal conditions of various weather phenomena. The main meteorological data include: average air pressure, annual average temperature, extreme maximum temperature, extreme minimum temperature, average relative humidity, average annual precipitation, average annual evaporation, average wind speed, maximum wind direction, sandstorm days, maximum frozen soil depth, maximum area Snow depth, annual sunshine hours, etc.

Sunshine hours refer to the number of hours the sun actually shines on a place. In a given period of time, the number of sunshine hours is defined as the sum of the periods during which the direct solar irradiance reaches or exceeds 120 watts/square meter, measured in hours and rounded to one decimal place. Sunshine hours can also be called actual sunshine hours.

Extended information:

Atmospheric pressure is the atmospheric pressure acting on a unit area, which is equal to the weight of a vertical air column extending upward to the upper boundary of the atmosphere per unit area. The size of air pressure is related to conditions such as altitude and temperature. Generally decreases with height. In the horizontal direction, differences in atmospheric pressure cause the flow of air. The unit used to express air pressure is the height of the mercury column.

For example, a standard atmospheric pressure is equal to the weight of a 760 mm high mercury column, which is equivalent to an atmospheric pressure of 1.0336 kilograms on a square centimeter area. Internationally, it is uniformly stipulated that "hectopascal" is used as the unit of air pressure. After conversion: one standard atmospheric pressure = 1013 hectopascals (millibar). The annual average air pressure in Shenzhen is 1009.8 hPa.