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 Pennsylvania in April. 1  17. 17Â°C max day temperature. 2  7. 7 hours of sunshine per day. 3  11. 11 days with some rainfall. 4  5. 5Â°C min night temperature. 5  13. 13 hours of daylight per day. 6  0. No heat & humidity. 7  95. 95 mm of monthly rainfall. 8  6. 6 (High) UV index.