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.
The average temperature in April is a delightful 22Â°C, which is two degrees higher than it was in March and three degrees below what it will be in May. Nights are very comfortable this time of year, averaging 16Â°C, which is ideal for evening walks, for example. The afternoons already get quite warm, the mercury reaching an average high of 28Â°C. Both these average low and high temperatures increase by about three degrees in the course of the month.