Abstract:The relationships among the air temperatures of litchi orchard, cano py and observation station in four weather types, i.e. the sunny, cloudy, rainy, and cloudy to sunny cases were analyzed based on field data in winter, 〖JP2〗2007/2008 and 2008/2009. The results showed that the canopy temperature changes between daytime and nighttime we re the largest in the sunny case, in the cloudy to sunny case the temperature changes between daytime and nighttime were the second, however, in the cloudy or rainy case the temperature changes between daytime and nighttime were smoot hly. In the same time, the orchard and observation station temperature changes between daytime and nighttime were closely related with weather types. Th e linear or curvilinear regression relationships of observation station and canopy temperatures w ere set up for da ytime and nighttime and the whole day based on different weather types . The res ults showed that the relationship models for cloudy and rainy cases and advectio n cold chilling were better than sunny and cloudy to sunny cases. In all models, the models of night time were the best. The results of this research show that it is feasible to monitor litch i cold chilling and frozen injury with air temperature of observation station.