Frost The frost solar term reflects a sudden drop in temperature、The temperature difference between day and night varies greatly、Autumn is characterized by a clear climate。The frost solar term is characterized by colder weather in the morning and evening、It is hotter at noon，There is a large temperature difference between day and night。In terms of national averages，Frostfall is the time of year when the temperature difference between day and night is greatest。Since the "frost" is cold、The manifestation of large temperature difference between day and night，Hence the name "frost fall", which means "sudden drop in temperature."、Day and night temperature difference is large"。After the frost falls on the solar term，The late autumn scene is obvious，Cold air moving south is becoming more frequent。

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