Abstract:Based on the daily temperature observation data of 5 stations in Shijiazhuang from 2008 to 2010，the average，extreme values and daily ranges of grass land temperature，as well as relationships between grass land temperature，ground temperature and air temperature under various meteorological conditions were analyzed．The results show that annual average of grass land temperature presented low in the north and high in the south，and highest in the south－west mountainous region．The maximum of annual mean grass land temperature was highest in the central region，the minimum of annual mean grass land temperature was lowest in the southwest mountainous region．The daily range of grass land temperature was affected by latitude，season and geographical conditions，and the diurnal amplitude was biggest in the central region．The diurnal amplitude of ground temperature was maximum，but minimum for air temperature．There was a positive correlation between grass land temperature and air temperature，ground temperature in a little cloudy days．The absolute difference of annual average value between ground temperature and grass land temperature was maximum when ground was covered with snow，but minimum in rainy days．

The variation characteristics of the pan evaporation and its climatic influencing factors in Shijiazhuang city in the last37 years are analyzed in this study by using themethods of cumulative anomaly and linear trendency estimation and complete correlation coefficient. The results show that the annualpan evaporation presented obviously decreasing trend, andmost significantly decrease occurred in spring, then in summer and autumn. The pan evaporation in a year and differentseasons has a positive correlationwith sunshine duration, average temperature daily range, averagewind speed and average land surface temperature, buta negative correlationwith average humidity. Themajor reason ofpan evaporation decrease in Shijiazhuang city is the decrease of sunshine duration and average temperature daily range, and the second is the decrease of averagewind speed and average land surface temperature.