Why is the temperature at 02: 00 on March 9 calculated like this?

It should be a set of calculation formulas. The lowest temperature appears at 6-8 am and the highest temperature appears at 2-4 pm. Calculate two temperatures according to the formula. I'll show you the real-time temperature map all day today, and you'll understand. Take the arithmetic average of the time corresponding to the lowest/highest temperature.

2 o'clock temperature =20 o'clock+the average of the lowest temperature.

All-day average = highest value+lowest value+arithmetic average of 2 corresponding values.