Is it cold in Hangzhou this year?

On the first day of 2020, Hangzhou was cold and sunny.

The lowest temperature drop caused by air appeared this morning. The Hangzhou Meteorological Observatory issued a low temperature report: on the first day of 2020, the lowest morning temperature in Hangzhou:-1℃-2℃ in plain area, with frost or frost, -3℃-1℃ in mountainous area, with thin ice, and it is even colder in high mountainous area, and it is expected to drop to -6℃- 3℃, with severe freezing.

Extended data:

There is a good saying: the winter is sunny to the sun, and the year is rotten. Many people remember that it rained from winter to Sunday this year. Why does it rain during the Spring Festival? According to the meteorological department, the scientific basis of these proverbs is the periodic oscillation of the atmosphere, or the periodic influence of cold air and warm and humid airflow.

If there happens to be strong cold air coming somewhere from the winter solstice without the influence of warm and humid airflow, it will form sunny weather. In the Spring Festival more than a month later, cold air comes periodically, and then encounters the circulation of warm and humid airflow. When cold and warm air meet, it will form a "rotten year edge" of rain or snow.

But in fact, the number of days from winter solstice to Spring Festival is not the same every year. Even if there is any periodic influence, it will become inaccurate because of the interval change of time length.

The Hangzhou Meteorological Observatory also counted the relationship between the winter solstice and the Spring Festival weather for this proverb. Decades of statistical data show that the accuracy of the law reflected by "sunny winter to sunny day, bad year" is less than 50%. The accuracy of similar statistics in other provinces is high or low, but it is basically around 60%.

This shows that some meteorological proverbs are just a reasonable empirical talk, but they are not necessarily correct and scientific when used to predict the weather.

Hangzhou Net-On the first day of 2020, the weather in Hangzhou was cold and sunny.