What is the meaning of cold dew?

Cold dew of year, starting from October 8 or 9, until 23 or 24.Off better in September, bringing in the autumn in October, we go all the way from the end of heat, the millennium, autumnal equinox, has been praised the fall, the cold dew season, we still will not grudge beautiful language.Leaves autumn wind, Japan Korea, the splendour, still is our country the weather in many parts of this period the main melody.At this point, the people of the south when begin to enjoy the cool autumn wind, the people in the north in appreciating the beautiful autumn.

Cold dew throttle, the sun's direct point has left the equator, by (5 ° 57 '11 ° 32' moved to the south of the equator, when the solar altitude angles in the northern hemisphere from large to small, the ground receives the sun heat significantly reduced than the summer, the temperature decreases obviously.Most regions of the country, and even south China will be affected by the cold air.At this time, many people began to express their feelings with "cold".

Literally, "cold" is cold cold dew, "dew" indicates the phenomenon of the surface layer of water vapor condenses into dew.But from the point of view of the weather, cold dew throttle and white dew, frost, the two solar terms, as represented by the heat change than its moisture content changes meaning is more apparent, it should be said that it is more embodies a kind of temperature change, seasonal transformation process.

Southern friends may have such problems, how do we haven't seen the dew when cold dew.Actually it is better to understand, becauseThe 24 solar termsCome from the Yellow River basin, at this point, the jiangnan temperatures are high, time is late than in the north of dew.

From cold dew to it at the back of the throttle frost even though only a short 15 days, but it is a year faster the temperature drop in for a period of time, if after the cold air, the average daily temperature drops 8 ℃, 10 ℃ are common.So this time is our country a turning point in many parts of climate change.