Hottest and Coldest Temperatures Ever in Allentown on May 18

On May 18th in Allentown, Pennsylvania, the weather can vary from sweltering highs to chilly lows. The highest temperature ever recorded on this day was a scorching 96.1°F back in 1962, while the coldest temperature reached a frosty 35.1°F in 1983. The average temperature for May 18th is 61.03°F, with an average high of 66.64°F and an average low of 55.42°F. In the midst of these temperature extremes, in 1962, John Glenn became the first American to orbit the Earth, marking a pivotal moment in the Space Race and space exploration history.