Why does this happen?

I know you get snow in New york David
the question was why dont we get snow in yorkshire except on the hills

The relatively warm waters of the North Atlantic Drift are responsible for moderating the climate of western Europe, so that winters are less cold than would otherwise be expected at its latitude. Without the warm North Atlantic Drift, the UK and other places in Europe would be as cold as Canada, at the same latitude. For example, without this steady stream of warmth the British Isles winters are estimated to be more than 5 °C cooler, bringing the average December temperature in London to about 2°C.