Chinese meteorologists said the country's average temperature in the first 11 months was 11.3 C, 1.2 C higher than the same period in an average year.
It was also the highest temperature since 1951.
"It is the 11th year for the country to experience an abnormally high temperature against the global backdrop of climate change," said China Meteorological Administration (CMA) spokeswoman Jiao Meiyan.
In November, the national average temperature was 3.5 C, 1 C higher than previous years.
Last month saw continuous droughts in southern parts of the country, heavy fog in the Yellow and Huaihe river basins and Sichuan Province, and a snow storm in Deqin, Yunnan Province.