Does it really snow in June?

According to the sixth issue of Primary School Science and Technology in 2002, in the past 20 years, due to the abnormal climate, "six in the snow" appeared in June, which was recorded by the meteorological department for three times:1981June1June, there was heavy snow in Guancenshan forest area, Shanxi Province, with a snow depth of 25 cm; On June 24th, 1987, there was a small snowflake floating in Shanghai. On June 5 of the same year, heavy snow fell in Zhangjiakou, Hebei Province, and the minimum temperature dropped to MINUS 7 degrees Celsius.

The direct cause of "6 in the snow" is mostly the strong cold advection in summer. For example, 1980 Moscow's "six in the snow" was caused by the invasion of cold current in northern Scandinavia. Recently, some experts believe that the appearance of "six stars in the snow" is related to solar activity, ocean current changes, volcanic eruptions and other factors that can lead to climate anomalies.