What does the weather forecast mean?

There are several situations when the weather forecast says how many degrees to how many degrees:

1, the highest and lowest temperature for a period of time, such as the daytime temperature from tonight to tomorrow is 8 to 2 1 degree, which means that the lowest temperature tonight is 8 degrees and the highest temperature tomorrow is 2 1 degree.

2. Maximum temperature range: For example, the maximum temperature can reach 35~37 degrees tomorrow, which may be caused by regional differences (the forecast temperature is 37 degrees east longitude and 35 degrees west longitude) or the forecast is uncertain (the approximate range of the maximum temperature is given).

3. Temperature change range: For example, the temperature (average temperature) will drop by 6~8 degrees within 48 hours, so it is very difficult to forecast, and the forecast is uncertain (giving the approximate cooling range).