Also rare in upstate NY, this on was 25 years ago:
On 31 May 1998, an F3 tornado struck Mechanicville, New York, injuring 68 people and causing $71 million in damage. The tornado was part of a widespread, severe weather outbreak across the northeast United States. The synoptic conditions that caused the outbreak and the mesoscale and storm-scale environments that produced the tornado are discussed.
https://journals.ametsoc.org/view/journals/wefo/20/4/waf875_1.xml
Tornados have occurred in all 50 States and in every month of the year. One of the worst tornadoes of the 1980’s was in, oddly, Edmonton, Alberta..May, 1985. Pretty sure was an F-5 too...