Based on the intensive observation data of temperature in July and August of 1997 to 1998, by means of the EOF technique, the high temperature distribution in Shanghai is analyzed. The result indicates that the high temperature distribution in Shanghai can be composed of the climatic and the first characteristic fields. The variance contribution of the first characTeristic filed is over 90% of the total variance. The results indicate that the mean distribution of the high temperature field in Shanghai is depended on the topography and urban heat island effect of Shanghai and is a relatively stable interannual variable. The coefficient of the first characTeristic filed is a day-to-day variable with high correlation with wind direction. The equation of the first characteristic filed coefficient is formulated based on the data from two weather stations and whereafter the method for determining the high temperature distribution in Shanghai is developed. The trial calculation of 13 high temperature days in 1999 and 2000 is satisfactory.
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