Boston is at 42.3601 N longitude, which is actually pretty far south-ish compared to Germany.
For comparison, Munich, Germany is 48.1351° N, Barcelona, Spain is 41.3851° N
For comparison, Munich, Germany is 48.1351° N, Barcelona, Spain is 41.3851° N
Köppen climate classification is probably the best indicator of where else is similar; which comes out as the same as most of northern Europe [1].
1. https://www.weatherbase.com/weather/weather-summary.php3?s=9...
The difference in summers - cool summer vs hot summer - is a big one, and I'd suggest that it makes Boston's climate not really the same as most of northern Europe. We haven't traditionally needed air conditioning in Germany, for example, while I understand Boston and New England (the upper mid-Atlantic and New York, surely, when I lived and visited there) come to rely on it during the summer months to not just live in puddles of sweat.
Chicago is comparable to Rome yet Rome rarely sees snow or the very cold windy weather Chicago is known for. You’re ignoring the whole jet stream.
Famously(?) New York is at the same latitude that Naples, they definitely don't have the same climate.
With that said, those are latitudes, not longitudes.
Someone once told be a simple way to remember the difference. Longitude and latitude was first used be Greeks to travel the Mediterranean ocean (not sure if that is true, but helps with remembering); The Mediterranean ocean is long from East to West, so moving in the long direction changes the longitude.