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The temporal and spatial variations of daily range of temperature were analyzed by using conventional data. The results show that there was a tendency of year-to-year decrease in daily range of temperature; daily ranges of temperature in summer and autumn were greater than those in winter and spring; the type of the underlying surface has great impact on daily range of temperature. Several case studies of obvious daily range of temperature were conducted, and the main influencing synoptic systems were the cold high, cold front, warm depress and subtropic high.