Abstract: In order to understand the law of climate change and its evolution trend in Datong under the context of global warming, this paper investigated the characteristics of extreme temperature change in Datong for the period of 1971-2010 by using the daily temperature data from 8 stations. The results showed that the extreme maximum temperature and the annual mean temperature are in a significant linear increased trend, by rising 0.5℃ and 0.3℃ per 10 years respectively. The extreme minimum temperature linear trend was not obvious, but with a noticeable interdecadal variation. The linear decreased trend of extreme cold days below -25℃ was not obvious, and the extreme hot days above 33℃ were in a significant linear increased trend by increasing 1.3 days per 10 years. The annual averaged temperature diurnal range was obviously increased after the year of 2000.

Key words: Extreme temperature, Change characteristics, Linear trend