Welcome to the official website of Jefferson County New York

Local Weather Conditions

Jefferson County is located directly to the east of Lake Ontario.  Lake Ontario effects the weather in Jefferson County constantly.  Thunder storms capable of producing hail and high winds as well as lake effect rain and snow storms often hit Jefferson County.  Jefferson County also has the St. Lawrence valley that often produces weather events.  All residents and visitors are reminded to frequently check and monitor weather activities here in Jefferson County.

Weather Forecast

Local Radar