What is the difference between the Beginning of Summer and the Summer Solstice in terms of climate? Why is it rainy during the Summer Solstice and hot during the Dog Days?

As the saying goes, if there is rain on the Summer Solstice, the dog days will be hot, and if there is no rain on the Double Ninth Festival, the winter will be sunny. The third Geng day after the Summer Solstice is the beginning of the dog days. The hottest thirty or forty days of the year are called the "dog days". What is the difference between the Beginning of Summer and the Summer Solstice in terms of climate? The following is a detailed introduction for you.

Contents of this article

1. Differences in climate between Beginning of Summer and Summer Solstice

2. Why is it rainy during the summer solstice and hot during the dog days?

3. Is it hot during the summer solstice?

Differences in climate between Beginning of Summer and Summer Solstice

During the Beginning of Summer, the western and central parts of the basin often experience summer droughts because of the late onset of heavy rains and less rainfall. During this period, the basin is harvesting early spring crops and sowing late spring crops, and special attention should be paid to the impact of changeable weather. Harvest in a timely manner on sunny days, and plant in rainy days. In rainy days, beware of sprouting and mildew of early spring harvested crops, and do a good job in drought resistance and seedling protection, and be alert to the harm of low temperatures below 20℃ to early rice.

The summer solstice is the solar term with the highest rainfall in the whole year in the eastern part of the basin. After that, it is often controlled by the subtropical high pressure, and summer drought occurs. In order to enhance drought resistance and seize agricultural harvests, it is an important measure to store rainwater before the summer heat in these areas. After the summer solstice, the ground is heated strongly, and the air convection is strong. Thunderstorms are often formed in the afternoon and evening. This kind of hot thunderstorm comes and goes quickly, and the rainfall range is small. People call it "summer rain across the fields." There are also some plains with heavy rainfall that need to take measures to prevent floods, keep abreast of weather changes in the next few days, and harvest crops in time.

Why does it rain during the summer solstice and be hot during the dog days?

At 0:38 on June 22, the summer solstice has arrived. This is the earliest established solar term among the 24 solar terms and the day with the longest daylight in the northern hemisphere throughout the year. But this does not mean that this is the hottest time of the year. Because the heat close to the surface is still accumulating at this time. However, the summer solstice also means that the "fu shi" is not far away.

The third Geng day after the summer solstice is generally considered the beginning of the dog days. The hottest thirty or forty days of the year are called the "dog days". Compared with last year, this year's "dog days" has 40 days, 10 days more. No wonder the saying goes, "Rainy summer solstice means hot dog days, no rain on Double Ninth Festival means sunny winter."

Is the summer solstice hot?

It's very hot, the weather is hot and humid, and there are many sauna-like days.

On the day of the summer solstice, the sun's direct position on the ground reaches the northernmost point of the year, almost directly above the Tropic of Cancer. The daylight in the Northern Hemisphere reaches its longest point, and the daylight gets longer the further north you go. For example, the daylight in Haikou, Hainan, is a little over 13 hours long, in Hangzhou it's 14 hours, in Beijing it's about 15 hours, and in Mohe, Heilongjiang it's more than 17 hours. On the day of the summer solstice, the Northern Hemisphere does receive the most heat from the sun, but in the dozens of days after the summer solstice, although the sun's position is not the highest, it is still quite high. Although the daylight is the longest and the sun's angle is the highest on the day of the summer solstice, the summer solstice marks the official start of hot weather, and the weather will get hotter and hotter, and it will be sultry. But it is not the hottest time of the year.