"The 2021 Africa Cup of Nations will be played in Cameroon from Jan. 9 to Feb. 6 in 2021," said FECAFOOT on Twitter.
"The date has been changed for meteorological reasons at Cameroon's request."
The tournament, played every two years, was switched to June-July last year when it was played in Egypt, provoking concerns about high temperatures.
The decision is likely to anger European clubs, in particular Premier League leaders Liverpool whose team includes Mohamed Salah and Sadio Mane in attack, two of Africa's top players, plus Naby Keita in midfield. (Writing by Brian Homewood; Editing by Ken Ferris)