Liu et al. developed a generalized model for estimating China's daily by using the , , and data of 98 solar radiation stations and 562 non-radiation stations in China, combined with solar radiation data, in addition to and data.
The daily data set of basic meteorological elements of China's national surface meteorological stations (V3.0) contains daily observations of basic meteorological elements measured at 2,474 major stations since January 1951.
For example, 98 stations with solar radiation are available and about 2400 national meteorological stations in China , . Besides, there are about 70 thousand regional automatic meteorological stations, which observe one or more of the rainfall, temperature, relative humidity, and wind speed .
Thus, understanding the long-term variations of solar radiation is important for planning the utilizations of solar energy resources over mainland China in the future. Measurement by pyranometer with accurately calibrated are the best way to obtain the long-term SSR data (Wang et al., 2012).
In China, only 97 solar radiation monitoring stations have been established on the mainland, and they are unevenly and sparsely distributed across the region (Tang et al., 2011 ).
Then, country-level meteorological parameters were developed for energy-efficient building assessment in China, based on actual meteorological data in the present study. This set of meteorological parameters may facilitate engineering applications as well as allowing the updating and expansion of relevant building energy efficiency standards.