A new study suggests that, in the case of global catastrophe, urban agriculture alone could sustain only about one fifth of the population of a temperate, median-sized city, but the whole city could be fed by also farming land within a short distance of the urban area.
Four seasons yes, but not cold enough for snow - coldest normal temperture would be -3C. Different plants grow than summer but you can get something if you choose your winter plants. Or maybe you only lose out a month of growing season.
Not to “uhm, acktshually”, but technically New York is temperate (according to Koppen, temperate subtropical, which leads me to question his wisdom), and it snows quite a bit there.
But I see your point. There are plenty of people living in less favorable climates agriculture-wise.
The city in question is in new zealand. While new york may be temperate (though it doesn’t show up in the maps I see - might be looking at maps on my phone) that doesn’t mean it is really comparible.