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.
April is marked by rising daily high average temperatures that range from 28 ÂºC to 33 ÂºC on most days of the month. During April, the average daily high temperature is 30 ÂºC. Daily average low temperatures vary between 19 ÂºC and 23 ÂºC, with an average daily low temperature of around 23 ÂºC.