The snowfall in Beijing has reached the standard of the first snow. What is the standard of the first snow?

The standard for the first snowfall in Beijing is that snowfall has been observed at three or more of the five stations in the urban area, and at least 1 station has snowfall? 0. 1 mm. Recently, Beijing ushered in the first snowfall in the winter of 2020. This year's first snow came earlier than normal, 8 days earlier than the common average first snow day, but it happened to catch up with this year's? Xiaoxue? The day before the solar term can also be called very appropriate. According to meteorological data, the first snow in Beijing has been getting late since 20 10, and the frequency of serious late is increasing. According to the date data of the first snow every year since 196 1, the first snow was seriously delayed by 8 years, half of which was after 20 10, 20 13, 20 17 and 2065438+. However, the first snow in Beijing on 20 19 came on time, neither early nor late, and it happened to visit Beijing on the snowy day of1October 29 165438+29. Is this the first time since 196 1? On time? The first snow. As the temperature drops, various convenient heating devices such as baby warmers and hot water bottles become popular. In this regard, experts remind that although the temperature of these heating equipment is not high, it is easy to cause skin unconsciousness due to long-term contact with the skin? Low temperature burn? . When using heating equipment, you should know its temperature range, and take certain isolation measures between skin and heat source, such as thick towels, and ensure that the heating equipment is properly wrapped to avoid falling off and scalding during sleep. Once you find yourself. Low temperature burn? Immediately wash the wound with cold water or apply cold compress with an ice pack towel, and go to a regular hospital in time. In addition, diabetics, blood circulation disorders, burn sequelae, and infants can't use it? Keep the baby warm? Such as convenient heating equipment, because the nerve endings of such people react relatively slowly, and once they encounter burns, they cannot be found in time.