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Northumberland County, PA (shown in white) has 457.68 mi² of land area and 19.55 mi² of water resources. The county is bordered by:
The county's elevations range from a low of 380.6' to a high of 1,699.5', with a weighted average of 781.6' above sea level.
Temperatures range from average lows around 19.4°F to average highs around 85.3°F. A year-round daily temperature averages 50.9°F. Average annual precipation is 46.1". With these temperatures and precipation, the majority of the county scores as an 6A using the USDA Plant Hardiness Zone Map (the standard by which gardeners and growers can determine which perennial plants are most likely to thrive in a location).
The estimated population of Northumberland County is 90,936 with 37,642 households. These households are spread across 26 unique municipalties (not all shown).
