Temperatures across Spain smashed records for December as a mass of hot air swept over the Iberian Peninsula on Tuesday, pushing the mercury close to 30 degrees Celsius (86 Fahrenheit) in the south and delaying the start of the ski season. While the Northern Hemisphere gears up for the arrival of winter, Spaniards’ hopes of a "white" Christmas are waning after a summer with four heatwaves amidst the hottest year on record, part of a global pattern of rising temperatures that is widely attributed by scientists to human activity.