Hottest and Coldest Temperatures Ever in Allentown on November 20

On November 20th in Allentown, the weather typically sees an average temperature of 42.28°F, with an average high of 48.42°F and an average low of 36.13°F. In 1985, a scorching heatwave hit the city, setting a record temperature of 75.0°F. However, in 2000, Allentown experienced a chilly spell with the mercury dropping to a frigid 16.0°F, the coldest ever recorded. In other news from those years, in 1985, the first-ever version of the GNU operating system was released, revolutionizing the world of computer software and paving the way for open-source development.