Monday, January 26, 2009

Philadelphia’s Climate In The Early Days

From Watts Up With That?

January, 1790 was a remarkable year in the northeastern US for several reasons. It was less than one year into George Washington’s first term, and it was one of the warmest winter months on record. Fortunately for science, a diligent Philadelphia resident named Charles Pierce kept a detailed record of the monthly weather from 1790 through 1847, and his record is archived by Google Books. Below is his monthly report from that book.

JANUARY 1790 The average or medium temperature of this month was 44 degrees This is the mildest month of January on record. Fogs prevailed very much in the morning but a hot sun soon dispersed them and the mercury often ran up to 70 in the shade at mid day. Boys were often seen swimming in the Delaware and Schuylkill rivers. There were frequent showers as in April some of which were accompanied by thunder and lightning The uncommon mildness of the weather continued until the 7th of February.

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