Which two solar terms does first frost refer to?

First frost refers to the cold dew and the first frost.

Cold dew is the seventeenth solar term among the twenty-four solar terms and the fifth solar term in autumn. Finger five, the sun reaches the yellow meridian195; Gregorian calendar1October 7 -9 10 every year. Cold dew is a festival in late autumn and the beginning of the full moon in the dry calendar.

Cold dew is a solar term reflecting the characteristics of climate change. When entering the cold dew, there is cold air going south, the temperature difference between day and night is large, and autumn dryness is obvious.

The first frost is the eighteenth of the twenty-four solar terms and the last solar term in autumn. Fight with your fingers; The ecliptic is 2 10, and every year1October 23-24 coincides with Gregorian calendar 65438+. After entering the first solar term in first frost, the scene of late autumn is obvious, and cold air moves southward more and more frequently. The first frost does not mean "frost", but refers to the sudden drop in temperature and the large temperature difference between day and night.

On the national average, "first frost" is the season with the largest temperature difference between day and night in a year.