Abstract
As the climate change aggravates, it's important for China's energy planning and management to consider energy demand for space heating and cooling. Based on the daily average temperature data of 835 meteorological stations nationwide from 1951 to 2016, the temporal and spatial characteristics of heating degree-day (HDD) and cooling degree-day (CDD) in China were examined. The results showed: 1) the annual average temperature was negatively correlated with the annual average HDD and positively correlated with the annual average CDD; 2) after the 1980s, the national HDD decreased significantly and the CDD increased significantly; 3) HDD saw a downward trend in all regions, with the fastest decline in North China and the slowest in South China. CDD in all regions showed an increasing trend, with the fastest rise in South China and the slowest in the Northeast; 4) HDD decreased from north to south with the CDD showing the inverse pattern.
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