Pontresina has an average of 97.8 days of rain per year and on average receives 799 mm (31.5 in) of precipitation. The wettest month is August during which time Pontresina receives an average of 104 mm (4.1 in) of precipitation. During this month there is precipitation for an average of 10.7 days. The driest month of the year is February with an average of 31 mm (1.2 in) of precipitation over 10.7 days
