Five characteristics of autumn

1, the temperature dropped obviously, the cold air in the north continued to invade, the solar radiation became less and less, and the temperature dropped obviously.

2, the temperature difference between day and night is large, the temperature is still high during the day, and the temperature may be very low in the morning and evening, and it even feels like two different seasons.

3, autumn typhoon should not be underestimated, autumn typhoon intensity is relatively strong, resulting in serious losses, affecting autumn travel.

4, windy weather increases, alternating cold and warm, so that warm air meets and interacts frequently, which is easy to form wind, so the autumn in the north is crisp.

5, the air is dry and humid, the temperature drops, the water evaporation is not obvious, the air humidity is small, and the strong wind will also aggravate the dryness.

Phenological characteristics of autumn:

It is autumn in beginning of autumn so far, which means that precipitation and humidity are at the turning point of the year, and there is a tendency to decrease or decrease. In nature, everything begins to grow from lush to rich and mature.

Autumn is the harvest season, and many plants mature in autumn. In autumn, in nature, the qi of yin and yang begins to change, the yang is gradually declining, the yin is gradually flourishing, the climate turns from hot to cold, and everything is born with cold and gradually falls. This is the season of alternating hot and cold. ?

As the temperature gradually drops, the leaves of many deciduous perennial plants will gradually change color, wither and fall off, leaving only branches for winter. Panicum miliaceum will come to the end of his life, wither and die.

Seasonal variation covers many aspects of climate characteristics, and it is not accurate to judge autumn only by temperature. The most obvious change in autumn is that the leaves of vegetation change from lush green to yellow, and the leaves begin to fall and the crops begin to mature.