Philadelphia Was 14 Degrees Colder Last Month Than 1790 stevengoddard 6 years ago X Privacy & Cookies This site uses cookies. By continuing, you agree to their use. Learn more, including how to control cookies. Got It! Advertisements Philadelphia averaged 30F last month – fourteen degrees colder than January, 1790. Advertisements Share this:Print RelatedPhiladelphia January Temperatures Declining Since 1790January 25, 2014With 7 commentsBU Biologist Says Coldest Start To The Year On Record Isn't A Late SpringApril 24, 2014With 34 commentsPhiladelphia July Temperatures Plummeted During The Dalton MinimumJuly 29, 2013With 5 comments