The climate comfort index(CCI)is the influencing degree of climate conditions on the human feeling.Based on the average values of temperature

wind speed

relative humidity of 13stations in Weihe Riverbasin during 1961-2010

CCI values were calculated for each station and days

duration and spatial distribution were also examined at all levels of CCI values.The results showed that the number of cold and very colddays was reducing and the comfortable days were increasing slowly

which is closely related to the air temperature changes.Except for Huashan Mountain station

CCI values were relatively high and the comfortabletime was longer than 5months per year for all the stations.On average

the number of days when CCI valuereached comfortable level accounted for 46.9%of the whole year

while cold and very cold days for 27.1%.There were no days with CCI values reaching hot or very hot.Spatially

CCI values were relatively higher atthe stations of Xi'an

Wugong

Tianshui and Baoji

followed by stations of Tongchuan

Luochuan and Huanxian County.