How to judge the weather by the temperature difference of a day

There is no basis for distinguishing weather by temperature difference. If you want to distinguish between sunny days and rainy days, you can distinguish them by air pressure, because the temperature changes at any time in a day with the change of sun height and cloud cover. Of course, the weather forecast of various technologically advanced mobile apps is actually very accurate, and it can be updated in real time, and the forecast of the future is also very accurate. However, if there is no mobile app or no network environment, the best basis for distinguishing the weather is the change of air pressure.

A sharp drop in air pressure usually means that a storm is coming and you need to seek shelter. If the air pressure drops by 4 4 hectopascals (0. 12 inch Hg) or more within 3 hours, there may be weather changes. If you are in the wild, you may need an outdoor watch to help you master the weather and provide early warning. Some outdoor watches with simple functions can only choose barometer or altimeter mode. If you are climbing a mountain, you need a portable barometer to measure the air pressure at the foot of the mountain, and then measure the air pressure at every other height, MINUS the air pressure drop caused by the rising height, and then compare it with the 3-hour safety range. (Generally, it will drop by 5mmHg per 100 meter, which is about 6.7hPa).

In addition, you need to know these units and be able to convert them.

inch of mercury

mmHg

Millibar millibar

Baipaska

1 hectopascal = 1 millibar =3/4 mm Hg.

The average pressure at sea level is about 10 13.25 hectopascals (760 mm Hg), which is also called standard atmospheric pressure.

Finally, any method can only roughly estimate the weather. If you travel, you should be prepared for emergencies. Sudden weather conditions may occur in some environments, so it is best to refer to the assessment of the weather network and try to master detailed data before going out.