The magnetic compass is an old Chinese invention, probably first made in China during the Qin dynasty (221-206 B.C.). Chinese fortune tellers used lodestones (a mineral composed of an iron oxide which aligns itself in a north-south direction) to construct their fortune telling boards.
Guide to Pennsylvania weather in April. The average maximum daytime temperature in Pennsylvania in April is a comfortable 17Â°C (63Â°F). The average night-time temperature is usually a cold 5Â°C (41Â°F). There are usually 7 hours of bright sunshine each day, which represents 55% of the 13 hours of daylight. Expect 95mm (3.7 inches) of rainfall across the whole of April with 11 days with some rain falling.
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.