When is it no longer cold?

It won't be cold after May 9, but the north still needs to wear cotton-padded jackets.

1929 didn't make a move. In 3949, I watched the river in 5969, opened the river in 79, and in 89 years, I added 19 in 99, plowing cattle everywhere. Three nine four nine is the coldest.

Note: In ancient times, the number nine paid attention to counting from a single day, that is, the winter solstice coincided with the single day of the lunar calendar, so this day was the first day of the ninth lunar month, which was called "consecutive winter nine". If it falls on a double day, it will be postponed for one day, and the next day will be called "Wearing Winter Nine". In the future, people seem to agree that the winter solstice will be counted as nine days, and it will last 998 1 day. The cold disappears completely and the sun shines high, so it is called "99 sunny day".

Jiulili, the degree of cold is explained by Jiujiu songs. You can't reach out in September and September, you can walk on the ice in March and April, you can talk about the river in May and September, and you can see the willows by the river in July, September and August. In 998 1 year, the scalpers all went to the fields (meaning they began to farm). 99 poplars fell to the ground, and 19 apricot blossoms bloomed. China is a vast country with different temperatures and different folk proverbs.