How many months in summer will the temperature drop below 30 degrees?

In summer, the temperature usually drops below 30 degrees in a few months, which is related to the region. It will be later in the south until after September. It's a little earlier in the north, in the middle and late August.

In China, summer begins in the long summer (between May 5th and 7th in Gregorian calendar) and ends in the beginning of autumn (between August 7th and 9th in Gregorian calendar). Westerners generally call summer the solstice and autumn the summer. In the southern hemisphere, 65438+February, 65438+ 10 and February are generally designated as summer.

In the northern temperate zone, the meteorological summer is from May 2 1 day to August 23 (summer heat) on the Gregorian calendar. In the south temperate zone, the meteorological summer is165438+1October 22nd (corresponding to the light snow in the northern hemisphere) to February 19 (corresponding to the rain in the northern hemisphere).

According to the characteristics of the earth's revolution, the summer duration in the north temperate zone is theoretically longer than that in the south temperate zone. (At the beginning of July, the earth was at perihelion, and its running speed was slow. At the beginning of 65438+ 10, the earth was at perihelion, and the running speed was fast. )

In the sense of modern climatology (climate average temperature) in China, it is summer when the average temperature exceeds 22 degrees for five consecutive days, and autumn when the average temperature falls below 22 degrees for five consecutive days.

Heatstroke routine

When the summer heat comes, many people with poor resistance, such as infants, pregnant women, the old and the weak, will suffer from heatstroke if they are not careful in the high temperature environment, and failure to rescue them in time may lead to tragedy. Therefore, in hot weather, these special people should take measures to prevent heatstroke and cool down. Infants and young children: wear thin cotton and light clothes. If you sweat, dry it immediately. Try not to use electric fans or air conditioners.

Before going out to play with water, you should choose a sunscreen lotion with a sunscreen coefficient lower than 15 without essence. The indoor and outdoor temperature difference should not be too large and the room temperature should not be lower than 25℃. It is best to put a basin of water in the air-conditioned room to avoid dryness.

Pregnant women: clothes should be cool and spacious, and eat more fresh vegetables and fresh bean products; Always scrub with warm water instead of taking a bath; Don't catch a cold because you are too greedy, but ensure sleep.

Old and weak: ensure no less than 7 hours of sleep every day, adjust diet to protect the spleen and stomach, don't eat more spicy food, and often eat light food; Because it is hot and sweaty, it is very important to replenish water, and at least 2500 ml of water should be added every day.

Once heatstroke occurs, you must first move out of the high temperature environment. Wipe the whole body with 40% alcohol or warm water, and apply ice packs to the superficial parts of blood vessels such as forehead, armpit and groin. In case of high fever, coma, convulsion and other serious diseases, they should be sent to the hospital for emergency treatment in time.