How to calculate the daily average temperature

There are three methods to calculate the daily average temperature, namely, the average temperature in four periods, the highest and lowest average temperatures in a day, and the average temperature in 24 hours.

The so-called four-time average method is to take the temperature at two o'clock in the morning, eight o'clock in the morning, two o'clock in the afternoon and eight o'clock in the evening, and then divide it by four to get the average temperature of the day. The calculation method of daily maximum and minimum average method is relatively simple, that is, the maximum temperature and minimum temperature of the day are added and divided by 2, and the obtained temperature is taken as the average temperature of the day.

The 24-hour average method is to add up the 24-hour temperature of the whole day and divide it by 24 to get the average temperature of the day. Different observation methods will have different effects on temperature series. The daily average temperature can be used to calculate spring, summer, autumn and winter. If the average daily temperature for five consecutive days is higher than 10 degrees, then the first day is spring.

Division method of entering spring

Spring is spring. The commonly used methods of season division in China mainly include "solar terms method" and "temperature method". Traditionally, "beginning of spring" in the 24 solar terms is regarded as the beginning of spring, and the spring divided by "solar terms law" indicates that the winter in which everything hides has passed and everything begins to enter the spring in which the sun is warm.

The "temperature method" adopts the division of "climate average temperature" by modern scholar Zhang Baokun. Spring begins when the average temperature of the day rises above 10℃ for five consecutive days, and ends when the average temperature of the day is higher than 22℃ for five consecutive days.

From the meteorological point of view, China belongs to the monsoon climate zone, and spring is the period of alternating winter and summer monsoon, so cold air and warm and humid air flow are changing and competing with each other. In the south, a cold air invades every three to five days in spring, and meets with the warm and humid airflow in the southwest, forming rainy weather, while in the north of China, most areas are still less rainy and dry.