Can't blame it all on the urban heat island. Average temperatures at 850 hPa (~1 mile up) over Dulles have been steadily warming over the past few decades. Simple linear trend is about 1°C over this 48 year period: https://t.co/fMpcAVUqyM pic.twitter.com/DDszA6D2W3

— Ryan Stauffer (@ryans_wx) March 1, 2021