According to the KÃ¶ppen Climate Classification system, Narvon has a humid subtropical climate, abbreviated Cfa on climate maps.  1 Narvon. 2  Lancaster County, Pennsylvania Highway Map (PDF) (Map). 3  Climate Summary for Narvon, Pennsylvania. Narvon is an unincorporated community in Salisbury Township in Lancaster County, Pennsylvania, United States. It has a sizeable Amish population.
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