Why is it coldest before and after sunrise?

This is because there is no cloud cover on sunny days, the sun shines on the ground and the temperature rises rapidly. The highest temperature appears in 14 ~ 16. After sunset, because there is no cloud cover, the ground dissipates heat quickly and cools down quickly. After sunrise, the ground gets sunshine again, so the lowest temperature mostly appears around sunrise.

In addition, wearing clothes in autumn depends on the weather during the day and at night. If it is sunny, the temperature rises obviously during the day and the temperature drops obviously at night; In rainy days, the temperature rise is not obvious during the day, and the temperature drop is not obvious at night. Therefore, when it is sunny, you should wear more clothes in the early morning and evening in the crisp autumn, and you can reduce your clothes at noon. On cloudy or rainy days, due to the cloud cover, the temperature fluctuates slightly, so there is no need to increase or decrease clothes frequently in the morning and evening and at noon.

Extended data

Exercise is healthier after sunrise;

Many people who insist on morning exercises choose to exercise before the sun comes out, thinking that this time will not be exposed to the sun, and the temperature is moderate, so they can breathe relatively fresh and oxygen-enriched air at this time.

In fact, it is more suitable for morning exercise after the sun comes out, because plant chlorophyll can only be photosynthetic with the participation of the sun.

Before sunrise, there was no sunlight on the leaves, and there was no fresh oxygen near the plants that had not been photosynthetic all night. Instead, a lot of carbon dioxide was accumulated, which was not good for health.

Minnan Net-Quanzhou today and tomorrow, the weather is still controlled by the high cold score, the temperature remains low, and the temperature difference between day and night is large.

People's Network-Outdoor Sports in Autumn? Exercise is healthier after sunrise.