Ratio data is interval data with a natural zero point. For example, time is ratio since 0 time is meaningful. Degrees Kelvin has a 0 point (absolute 0) and the steps in both these scales have the same degree of magnitude.
Bethlehem, PA Weather. The average temperature of Bethlehem is 51.25Â°F, which is higher than the Pennsylvania average temperature of 49.80Â°F and is lower than the national average temperature of 54.45Â°F. Historical Weather.
Weather in Allentown in December 2017. Expect 4Â°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Allentown in December. Check more long-term weather averages for Allentown in December before you book your next holiday to Pennsylvania in 2017.