The countryside in the north will be very lively in spring, summer and autumn. For example, farmers who sow and harvest for a living, and people who have no job to work outside, are busy working to make money in three seasons except winter, and generally have little free time, and people from other places may not come back to attend banquets.
Only in winter, when the countryside is busy, there is nothing to do. People who work outside will basically choose to go home in winter. After a busy year, people can only have a rest in winter or near the New Year.
In this season, adults have time to do things and relatives and friends have time to congratulate each other. Most importantly, people will have money in winter, rice will be sold in winter, and money will be brought back from work. Rural people have the most money in winter.
Therefore, in the northern rural areas, there are relatively more people getting married in winter. And as a northerner, accustomed to the cold in winter, getting married in winter will not feel much better.