In which month of the year does the temperature drop significantly?

Generally starting in mid-to-late September, the temperature drops significantly and the weather becomes cooler.

There are twenty-four solar terms in a year. In ancient my country, farming was done according to the twenty-four solar terms. Each solar term had corresponding farm work, which was also determined according to the weather conditions

These solar terms.

The Beginning of Autumn is the 13th of the twenty-four solar terms. It falls from August 7th to 9th every year. "Autumn" means the end of summer and the beginning of autumn. After the beginning of autumn, although the heat is not going away for a while and there is the lingering power of "autumn tiger", the general trend is that the weather gradually becomes cooler.

White dew: The weather turns cooler and the dew condenses and turns white. The white dew usually occurs in September, and the cool weather usually starts at this time.

Extended information:

Characteristics of the twenty-four solar terms:

Autumn

Beginning of Autumn: Dou points to the southwest; the sun's yellow longitude is 135° . The beginning of autumn. The festival falls on August 07-09 in the Gregorian calendar.

End of heat: Dou Zhi Wu; the yellow longitude of the sun is 150°. Chu means termination and hiding. Sushu means the end of the hot summer days. The festival falls on August 22-24 in the Gregorian calendar.

Bailu: Douzhigui; the yellow longitude of the sun is 165°. The weather has turned cooler and the dew has condensed and turned white. The festival falls on September 7-09 in the Gregorian calendar.

Autumn Equinox: The Fighting Zhi is already; the ecliptic longitude of the sun is 180°. Day and night are equally divided. The festival falls on September 22-24 in the Gregorian calendar.

Cold dew: fighting nails; the yellow longitude of the sun is 195°. The dew is cold and will freeze. The festival falls on October 8-09 in the Gregorian calendar.

Frostfall: Douzhixu; the sun’s yellow longitude is 210°. The weather is getting colder and frost is starting to appear. The festival falls on October 23-24 in the Gregorian calendar. ?[2]?

Winter

The Beginning of Winter: Dou refers to the northwest; the ecliptic longitude of the sun is 225°. The beginning of winter. The festival falls on November 7-8 in the Gregorian calendar.

Xiaoxue: Dou Zhiji; the ecliptic longitude of the sun is 240°. It means it starts to snow. The festival falls on November 22-23 of the Gregorian calendar.

Heavy snow: Douzhigui; the sun's yellow longitude is 255°. Snowfall is increasing and there may be snow on the ground. The festival falls on December 6-8 in the Gregorian calendar.

Winter Solstice: Douzhizi; the ecliptic longitude of the sun is 270°. The cold winter is coming. The festival falls on December 21-23 of the Gregorian calendar.

Xiaohan: Douzhizi; the yellow longitude of the sun is 285°. The climate begins to get colder. The festival falls on January 5-7 in the Gregorian calendar.

Great Cold: Fighting finger is ugly; the yellow longitude of the sun is 300°. The coldest time of the year. The festival falls on January 20-21 of the Gregorian calendar.

Reference: Baidu Encyclopedia-Twenty-Four Solar Terms