Hottest and Coldest Temperatures Ever in Allentown on December 09

On December 9th in Allentown, Pennsylvania, the weather history shows a wide temperature range. The hottest temperature ever recorded on this date was 66.0°F in 1980, while the coldest temperature reached 7.0°F in 1989. The average temperature for December 9th is 35.23°F, with an average high of 41.30°F and an average low of 29.16°F. Interestingly, during the year 1980, when Allentown experienced its highest temperature, the famous Mount St. Helens volcano in Washington state erupted, causing significant devastation and ash clouds that affected weather patterns across the globe.