Allentown, Pennsylvania, Average Temperature Rankings, March 2021 1991-2020 Degrees Fahrenheit 1 42.5 39.0 3.5 91 10 1960 2012 2019 2020 top-tenth 2 35.8 34.9 0.9 82 19 1934 2012 2019 2020 top-third 3 34.3 32.7 1.6 87 12 1934 2012 2019 2020 top-third 4 34.2 32.9 1.3 87 12 1978 2012 2019 2020 top-third 2006 5 36.7 34.8 1.9 89 8 1934 2012 2019 2020 top-tenth 6 39.6 37.9 1.7 86 10 1934 2012 2019 2020 top-tenth 7 43.2 41.7 1.5 86 10 1934 2012 2019 2020 top-tenth 8 47.1 45.5 1.6 87 9 1934 2012 2019 2020 top-tenth 9 50.5 48.6 1.9 91 5 1934 2012 2019 2020 top-tenth 2006 10 52.5 50.7 1.8 90 6 1934,1941 2012 2019 2020 top-tenth 2022 11 53.0 51.5 1.5 90 6 1941 2012 2019 2020 top-tenth 12 52.7 51.4 1.3 89 7 1941 2012 2019 2020 top-tenth 18 48.7 46.9 1.8 89 3 1941 2017 2020 2017 top-tenth 24 53.3 51.4 1.9 89 3 1926 2017 2020 2017 top-tenth 36 52.9 51.3 1.6 85 3 1941 2018,2022 2020 2018 top-tenth 48 52.6 51.3 1.3 81 4 1941 2019,2022 2018 2020 top-tenth 60 52.8 51.3 1.5 80 2 1944 2020 2019 2020 top-tenth