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http://www.islandnet.com/~see/weather/elements/dawncold.htmmost places are at the minimum temperature shortly after sunrise but within an hour after of sunrise. The reason for this is that when the sun angle is low, the energy still being lost to space (long wave or IR radiation) exceeds the amount that is being received during that first half hour or so after sunrise. The low sun angle means that the energy per unit area is low (the sunlight is spread over a larger area.) and the amount that is lost to the atmosphere due to the much larger distance the energy is traveling through the atmosphere at the low angle. Thus, the temperature continues to cool until the energy received from the sun, exceeds the amount being lost. which is not until the period of 1/2 to one hour after sunrise. http://answers.Yahoo.com/question/index?qid=20081224103509AAB3YA9

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