While the lower areas of the mountain are firmly oceanic (Köppen Cfb), Puy de Dôme has a humid continental (Köppen: Dfb) with borderline subalpine characteristics, thanks to its high elevation. Its classification is determined from its January average being well below the -3° threshold (with -5° as its usual lows), and for having over 4 months of average temperatures that exceed 10° (the requirement for this climate category is to have at least 3 months).