指一天内太阳直射光线照射地面的时间。
...日照时数 [gap=2710]nvironment change,climatic characteristics,maximum and minimum air temperatures,duration of sunshine ...
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年累积日照时数为2903小时。
温度、日照时数对棉花脱叶速度、脱叶率及吐絮率有一定影响。
The rate of shed leaves and boll open were influenced by temperature and sunlight hours.
另外，呼和浩特市雷暴日数、雾日数增加了，而日照时数在减少。
The number of thunderstorm day and the fog day was increased but the sunshine duration was decreased.
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