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.
CLIMATE OVERVIEW : Allentown, Pennsylvania, gets 46 inches of rain per year. The US average is 39. Snowfall is 32 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 77. On average, there are 201 sunny days per year in Allentown, Pennsylvania. The July high is around 84 degrees. The January low is 21. Sperling's comfort index for Allentown is a 45 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.