*12月平均气温：每日的最高气温逐日降低（从10°C 降到 -1°C）就是这个月的特点。
*FUN FACTS:Philadelphia is the home of the Philadelphia Stock Exchange, the oldest such exchange in the United States of America. It was founded in 1790.Philadelphia was where the first American Flag was designed, sewn by Betsy Ross out of her humble upholstery shop.
*逸闻趣事：费城是费城证券交易所的发源地，成立于1790。第一面美国国旗诞生于费城。逸闻趣事：费城证券交易所的发源地，成立于1790。第一面美国国旗诞生于费城。
*SIGHTS: Independence Hall, Philadelphia Museum of Art, Liberty Bell Center, The Franklin Institute, Rittenhouse Square.
*景点：独立会堂、费城艺术博物馆、自由钟、The Franklin Institute, Rittenhouse Square.