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Primary Guide at Spiders.us, Contributing Editor for Araneae at BugGuide.net and American Arachnological Society member.
Sign In to followOcrepeira looks right to me too. I don't know how to get these to species yet, it looks like it should be O. ectypa or O. georgia by range. If you submit it to BugGuide.net if someone over there ever figures out how to sort them you'll be notified. Looks like yours would be the first NY submission for the genus over there too.
Wow, this isn't even the first year you've seen them in your yard? If you find the time could you please also submit these to BugGuide.net? They'll document your find there as well.
N. domiciliorum, not crucifera, ignore the confusing label on the reference link. :)
They look like Orbweavers but I'm not positive which one.