Change Characteristics of Temperature in North China since Recent 50 Years

This paper analyzes mainly the change characteristics of the mean temperature,daily minimum temperature and daily maximum temperature with the time in north China including northeast China,north China and northwest China during the period of 1951-2000.The results are as follows: The increasing trends of mean temperature,daily minimum temperature and daily maximum temperature are extremely significant in north China since recent 50 years under the background of global climate warming;the increasing intensity of temperature in northeast China is higher than that in north China and northwest China,the increasing speed of daily minimum temperature is faster than that of mean temperature and daily maximum temperature,and the increasing trends of these temperature are more obvious in winter than that in summer;moreover,there are the significant abrupt changes in mean temperature,daily minimum temperature and daily maximum temperature in the mid- and late-1980’s;The temperature has apparently increased since the 1990’s.However,it is not absolute as the change characteristics of multiannual average temperature in the different seasons and regions.