Traditionally, Peruvian coffee growers start picking their crop in April, some six months before the global arabica harvest. Its flip season has given Peru, the world's sixth largest exporter of coffee, a unique comparative advantage.

If the season continues to move earlier, farmers worry they could lose their privileged position.

While climate change might make new land available to farm coffee, it could also expose the crop to unusual precipitation and atypical levels of humidity. Peruvian growers have said the scarcity of rains this year in some coffee-producing areas is the result of rising global temperatures.

Climate change has also been blamed for last year's drought in Brazil and winds in Guatemala. Both slashed coffee yields.