Sihai network

When is the hottest day? How many days in three volt days?

In the countryside, there is a saying "cold in September, hot in three volts". It's summer every year, especially when it's three volts, it's sweltering. I want to stay in the air-conditioned room every day. It's the most comfortable thing to hold the watermelon, connect with WiFi, and brush the headlines on my mobile phone. When is the hottest time in the dog days? Let's get to know.

Three volts are divided into first, middle and last. According to the solar calendar, it is generally from the middle of July to the middle of August. The first 10 days, the middle 10-20 days and the last 10 days are the hardest in the whole summer.

The hottest is Zhongfu. It's hot, sultry and humid. It's like a sauna in minutes. This year, Zhongfu has 20 days. It's terrible to think about it.

There's a reason why it's so hot in the dog days. In summer, the sun is very close to our side. It has a long straight time and high temperature. Although after the summer solstice, the days are shorter and the nights are longer, when the sun falls in, it feels that the days are still very long. The sun comes out early and goes down late. The sun shines for a long time and the temperature is high.

In fact, the heat we feel is mainly the heat from the surface. In summer, the sun shines for a long time, the surface absorbs more heat, and the heat dissipates slowly at night. In addition, the humidity is high, so we will feel very hot. When we reach the middle voltage, the surface temperature accumulates to the highest value, and the weather is the hottest. In particular, the clouds are relatively low in the sky. Before the rain, it is especially hot and uncomfortable.

In summer, there is more rain, high air humidity, and the heat capacity of water is larger than that of dry air, which is one of the reasons why people feel sultry in the summer.

In summer, from July to August, the subtropical high over the Western Pacific Ocean affects most of China. Under the control of the subtropical high, the pressure inside the high pressure sinks, resulting in a clear sky and cloudless sky, a long time of sunlight exposure, and an increase in ground radiation temperature, which makes it very hot on the ground.

After entering the dog days, the weather is hot and humid, so we should pay attention to heatstroke prevention.