Weighted mean temperatures(WMT) of Zhangjiakou, Beijing and Xingtai are calculated by using different methods. Results indicate that there are some systematic errors in the WMTs of North China obtained using the common calculation methods. Based on the relationship between the WMT and local surface meteorological elements, single factor and multi-factor regression equations for WMT are developed, and these local regression equations are able to satisfy the requirements of real time use and high accuracy for the retrieval of precipitable water from ground-based GPS remote sensing data.