location/climate/topography

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LOCATION
Jefferson County is located in the northeast section of New York State at the juncture of Lake Ontario and the St. Lawrence River. The county borders Lake Ontario on the west, and the St Lawrence River on the north. The Tug Hill Plateau is in the southern section of the county. To the northeast is St Lawrence County, to the east Lewis County, and to the south is Oswego County.  Jefferson County is located directly south of the Province of Ontario, Canada. The St Lawrence River and Hill Island are the dividing lines between the United States and Canada.




CLIMATE
Jefferson County enjoys four distinct seasons.  The monthly average temperature from the past 10 years ranges from a low of 13 degrees F in January to a high of 80 degrees F in July. The average minimum/maximum temperature for January is 13/31 degrees F, while for July it is 59/80 degrees F.  The yearly average precipitation is 28.1 inches; the average annual snowfall is 63.7 inches.  The growing season is approximately 171 days. 




TOPOGRAPHY
Topographically, Jefferson County can be divided into the St Lawrence River Valley, the Thousand Islands Region, Lake Ontario lowlands, the Tug Hill Plateau, Black River Valley, and the Theresa Lakes Region. The county encompasses 1,293 square miles, making it the ninth largest county in New York State.

The topography of the county is widely varied. To the north and west is generally flat rolling plain with a thin soil mantle over rock, much of which is apparent on the the surface. The south and southeastern sections of the county are marked by a high plateau, rising to an elevation of 1,700 feet above sea level with an irregular surface pattern. The glacier till veneer which covers most of Jefferson County varies from a few inches to several feet in depth and consists of a mixture of stone, gravel, sand, silt and clay.

Jefferson County soils have been grouped into four resource areas: clay, silt-loams upland high-lime loams and upland acid loams. These areas are divided according to local conditions which influence the management of that soil. Approximately 80 soils have been named according to different characteristics – drainage, structure and natural fertility.

For more information on weather in the area, please visit: www.weather.com