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December 2021 was Philly’s second warmest on record. Climate change explains the trend.

Only December 2015 was warmer than the last month of 2021, according to 147 years of weather records.

People ice skate on a warm day at the Blue Cross Riverrink Winterfest on the Delaware River Waterfront in Philadelphia, Pa. on Tuesday, December 14, 2021. It was the second warmest December on record.
People ice skate on a warm day at the Blue Cross Riverrink Winterfest on the Delaware River Waterfront in Philadelphia, Pa. on Tuesday, December 14, 2021. It was the second warmest December on record.Read moreMONICA HERNDON / Staff Photographer