Sydney vs NYC climate/summers?

New York is not sub tropical. New York is temperate. Sub tropical is warmer than temperate, you have them mixed up. Florida is sub tropical.

Sydney is at 34°S, New York is 41°N. The closest equivalent to New York in Australia would be Hobart while the US equivalent to Sydney would be Wilmington NC. Both New York and Sydney are on east coasts and subject to the trade winds in summer although NY has them for a briefer period than Sydney. It has snowed in Sydney on half a dozen occasions, it even snowed at Manly Beach in 1928. I recorded it myself at Bankstown Airport in 1986. The snow melted when it hit the ground but it was definitely snow while it was in the air.

It does NOT snow in Sydney, ever. Does that help?

Sydney has more extreme heat in summer than New York even though its summer weather averages at almost 26 degrees Celsius while NYC at 29 degrees. But they rarely get heatwaves, as opposed to Sydney. However, it's a different story in western Sydney where summer temps average at around 28-30. And they're not as humid as in Sydney CBD. NYC is also way more cloudier and humid than Sydney, while there is a sense of dryness in Sydney (i.e. bushfires). NYC is humid continental, but under Koppen it's humid subtropical for some odd reason and that's a little weird, as warm cities like Brisbane & New Orleans are humid subtropical too (crazy, huh?). A snowy city shouldn't be called "humid subtropical", even if its summers peak at 29 degrees.