The decrease of daily range of air temperature was probably to associate with the asymmetrical variation of the maximum and minimum temperatures;moreover,and it significantly it associate with the sunshine duration and cloud cover too.
日较差的减少与最高、最低气温变化的不对称性有关,也与日照时数、云量的变化显著相关。
参考来源 - 近47年上海最高、最低气温的变化特征及城郊差异·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
The trends of air temperature, precipitation and sunshine duration changes exhibited spatial variations over the research regions.
研究区气温、降水量、日照时数的变化趋势在空间分布上存在着一定的区域差异。
Cloudy conditions prevailed for most of April. The total bright sunshine duration was only 73.6 hours, the tenth-lowest April record.
四月大部分时间多云，总日照量只有73.6小时，是四月份的第十最低纪录。
The temporal distribution characteristics of sunshine duration and its spatial variation with different altitude, slope and aspect were analyzed.
并分析了山区实照时数的时间分布特征和不同海拔高度、坡度和坡向上年实照时数的空间分布特征。
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