There are many countries in Europe, and many cities, and salaries differ wildy. You'll get a higher salary in northern Europe (Germany, UK, Netherlands, etc.)

There are many countries in Europe, and many cities, and salaries differ wildy. You'll get a higher salary in northern Europe (Germany, UK, Netherlands, etc.) than in southern Europe (Spain, Italy, France). Also you'll get a higher salary in a tech hub like London or Berlin and a lower one in the country side. There are variations in US too, although probably not as big as between European countries.