Jefferson, NY County has a humid continental climate with cold winters and warm summers. The average temperature range for the year is between 24°F and 77°F. During the winter months, temperatures can drop to as low as -6°F while in summer they can reach up to 91°F. Rainfall is fairly evenly distributed throughout the year with some heavier rains during spring. Snowfall generally occurs from November to April with an average of 81 inches each season. Because of its location just north of Lake Ontario, Jefferson also gets lake-effect snow which can often increase seasonal totals by 20 inches or more.
Jefferson County, New York gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Jefferson County averages 110 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 161 sunny days per year in Jefferson County. The US average is 205 sunny days.
Jefferson County gets some kind of precipitation, on average, 161 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 80 degrees
Winter Low: the January low is 9
Rain: averages 40 inches of rain a year
Snow: averages 110 inches of snow a year