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In page Delaware Valley:
"Using the -3 °C January isotherm as a boundary, all of the Delaware Valley is humid subtropical except for portions of Berks County and higher areas of northern Chester County. The warm-summer humid continental climate (Dfb) only exists in higher areas of Berks where all monthly temperatures average below 22 °C. The hardiness zone in the region ranges from 6a in higher areas of Berks to 7b.
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