Conca is a commune in the Corse-du-Sud department of France on the island of Corsica. It is the southern terminus of the GR 20 walking ro…Conca is a commune in the Corse-du-Sud department of France on the island of Corsica. It is the southern terminus of the GR 20 walking route. Conca has a mediterranean climate. The average annual temperature in Conca is 16.9 °C. The average annual rainfall is 866.3 mm with November as the wettest month. The temperatures are highest on average in August, at around 26.0 °C, and lowest in January, at around 9.5 °C. The highest temperature ever recorded in Conca was 40.6 °C on 2 August 2022; the coldest temperature ever recorded was −3.4 °C on 27 February 2018.