How many seasons are there in the tropics?

1. Tropical rainforests have no seasons, and it rains all year round. Tropical grassland has rainy season and dry season; Tropical desert climate has no integrity, and it is dry season all year round.

2. The temperature and cold and warm changes in the four seasons in tropical areas are very small, but the time when it rains and does not rain is quite concentrated, so it is generally divided into rainy season and dry season. The rainy season is hot and the dry season (or cool season) is cold.

3. The tropics lie between south latitude 10 degrees and north latitude 30 degrees. These areas are located in the transition zone between the subtropical high and equatorial low in the northern and southern hemispheres, so the northeast wind blows in the northern hemisphere and the southeast wind blows in the southern hemisphere; Its wind direction and wind speed are almost stable in a year, which climatologists call "trade wind zone" or "trade wind zone".

4. In a year, the range of direct sunlight on the earth's surface swings back and forth between the tropic of cancer in the northern and southern hemispheres (23.5 degrees south latitude to 23.5 degrees north latitude). When the sun shines directly on the Tropic of Cancer (the summer solstice in the northern hemisphere), besides the highest temperature near the Tropic of Cancer, the equatorial low-pressure area will also move northward to the tropical area with the northward movement of the direct sun, so that the rainy phenomenon in the equatorial low-pressure area will also be brought to the tropical area and become a hot and rainy climate. When the sun shines directly near the tropic of Capricorn (winter solstice in the northern hemisphere), the equatorial low pressure area will also move to the southern hemisphere, which will make the tropical area in the northern hemisphere controlled by the northeast trade wind area and the southern edge of the subtropical high pressure area, forming a climate with scarce rainfall.

According to this, climatologists divide seasons according to the characteristics of rainfall distribution, rather than using the standard of cold and warm. For example, in Sudan, North Africa, the season of 1 year is divided into three seasons, that is, 1 to1is a dry and cool season; February to May is the dry and hot season; The rainy season is from June to 10. The dry and cold season and dry and hot season are collectively called "dry season".