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 combined average temperature over global land and ocean surfaces for April 2016 was 1.10Â°C (1.98Â°F) above the 20th century average of 13.7Â°C (56.7Â°F)âthe highest temperature departure for April since global records began in 1880. This value surpassed the previous record set in 2010 by 0.28Â°C (0.50Â°F).