Under the influence of continual Siberia cold air, rare continual low temperature overcast and rainy weather occurred in Wuxi from late February to April in 2010, which seriously affected the tea and some economic forest which flowered early, and led to the huge yield decrease of tea and other agricultural crops. According to statistical analysis, the occurrence frequency of late spring cold in Wuxi presented obvious decreasing tendency since 1980s, but in the context of global warming, the phenology of agricultural crops in Wuxi experienced certain changes, the new standards of late spring cold were drafted: the moving average temperature was at least 1.5 X. Below the annual average in ten consecutive days from Middle March to Late April, during which the average temperature should also be lower than that of the previous ten days.%受西伯利亚冷空气的连续影响,2010年2月下旬至4月底,无锡出现了少见的连续低温阴雨天气,对茶叶和部分开花早的经济林果类影响较大,造成了茶叶等农作物的大量减产.根据统计分析,20世纪80年代以来无锡倒春寒发生次数按年代纪变化呈现明显下降趋势,在全球气候变暖的背景下,无锡地区农作物的物候特征有所改变,制定了适合无锡的倒春寒标准:3月中旬至4月下旬之间连续10 d滑动平均气温低于常年平均值1.5℃或以上；这期间的10 d平均气温还需低于前10 d的平均气温.
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