What does the sudden drop in temperature mean?

A sudden drop in temperature refers to a sudden drop in temperature, reaching more than ten degrees.

The meaning of "suddenly":

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It's very cold. ~ naturally. Storm ~ rain.

In meteorology, the physical quantity representing the degree of air heat and cold is called temperature, which is referred to as temperature for short. The international standard unit for temperature measurement is Celsius (℃).

The temperature mentioned in the weather forecast refers to the air temperature measured in the open air without direct sunlight (usually measured by blinds). The highest temperature is the highest temperature in a day, generally appearing in14-15; The lowest temperature is the lowest temperature in a day, usually before sunrise.