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.
Key weather averages for Philadelphia in January. 1  3. 3Â°C max day temperature. 2  5. 5 hours of sunshine per day. 3  11. 11 days with some rainfall. - 4 5. 5  10. 10 hours of daylight per day. 6  0. No heat & humidity. 7  84. 84 mm of monthly rainfall. 8  2. 2 (Low) UV index.