Is October autumn or winter?

October in the solar calendar is autumn.

Autumn is the third season of the year, and the transition season from summer to winter is from September to165438+1October in the northern hemisphere, from March to May in the southern hemisphere, and from the autumnal equinox to the winter solstice in astronomy. Meteorologists' criteria for studying phenology are as follows: after the summer heat, the five-day average temperature below 22 degrees is autumn, and it ends below 10 degrees, so October in the solar calendar is autumn.

Winter is the coldest season of the year in the northern hemisphere, and the others are spring, summer and autumn. Astronomically speaking, it was from February to February, 65438. China used to refer to the three months from beginning of winter to beginning of spring, and also to the three months of October, November and December in the lunar calendar.

Extended data:

Basis of seasonal division

1, astronomical season

Seasons divided according to astronomical factors. Because the earth's axis of rotation is inclined to its orbital plane around the sun (i.e. ecliptic plane), the variation of solar radiation on the earth's surface circulates regularly once a year. Every year in the same month, all localities generally have their own climate characteristics.

In temperate regions, the hottest period receiving the most solar radiation is usually called summer, the coldest period receiving the least solar radiation is called winter, and the transitional period between them is called spring and autumn. For example, in temperate regions of the northern hemisphere, March-May is spring, June-August is summer, September 9- 10/October is autumn165438+1October, and 12- February is winter.

2. Climate season

Dividing seasons according to the distribution of climatic factors. The climate season in China was first studied by Zhang (1934). In his article The Distribution of Four Seasons in China, he proposed that the average temperature in five days in winter is below 10C, above 22C in summer, and between 10 ~ 22c in spring and autumn, and drew the length of four seasons in different places.