Temperatures in the mountain range will increase by between 2.8 and 4.0 degrees Celsius between 2070 and 2100, Spain's CSIC scientific research agency said.

"Because of global warming, the ski season will begin later and the spring thaw will come up to a month earlier," one of the experts behind the study, Juan Ignacio Lopez Moreno, told AFP.

"What is snow today will be rain tomorrow," he said.

"With temperatures above 0 C (32 F), the snow machines do not work well and the snow they produce melts right away."

CSIC study said the effects of global warming will be more evident on the southern Spanish side of the Pyrenees.