Hottest and Coldest Temperatures Ever in Allentown on December 31

On December 31st in Allentown, the weather fluctuated between extremes, with the hottest temperature recorded at 61.0°F in 1965 and the coldest temperature dropping to -6.0°F in 1963. The average temperature for this date as of 2021 is 31.79°F, with a high of 38.32°F and a low of 25.27°F. Looking back to the past, an interesting news item from those years is that in 1969, the Lehigh Valley Mall, a major shopping destination, opened its doors in Allentown, bringing new opportunities for retail and economic growth to the region.