When I first moved to Oregon I often heard local Pinot Noir wineries proclaim "we're at the same latitude as the best wine regions in France! That's why our wine is great here too!" Every weekend in the Fall, I get muddy in local bike races then go home to watch similar races taking place around Belgium, with similar weather and I've often wondered how my latitude compared with theirs.
Now I know that latitude determines length of daylight pretty consistently but isn't a great comparison to weather — The west coast of the US has a cold ocean current and a jet stream to match while the Atlantic that makes up the west coasts of the European continent has a warmer ocean current and different weather to match. Still, it's interesting when making rough comparisions to know if Los Angeles is really like the south of France/Italy (it's actually in Northern Africa, latitude-wise), and I've wondered ever since a friend moved to Helsinki if that was as far north as our Alaskan cities (it is).
Here are major European cities overlaid on North America, corrected for the identical latitude (click to view full sized):