The primary phase of all meteorological elements is short, but with more fog days and a better regularity of fog day probability.

各成雾气象因素的主段均短，对应雾日多，对应的雾日机率规律性好；次段虽长，对应雾日却少，规律性有的也较差。

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The primary phase of all meteorological elements is short, but with more fog days and a better regularity of fog day probability.

各成雾气象因素的主段均短，对应雾日多，对应的雾日机率规律性好；次段虽长，对应雾日却少，规律性有的也较差。

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