I'm confused by this part. The summer Milky Way will look brighter. If the author is referring to the galactic center being in view, then wouldn't that depend

I'm confused by this part. The summer Milky Way will look brighter. If the author is referring to the galactic center being in view, then wouldn't that depend on whether it's summer in the northern hemisphere, or the southern hemisphere? After all, each hemisphere's summer is looking the opposite direction. If the author is simply referring to the season, well I'd think the winter - having longer nights, colder atmosphere, and, at some latitudes, having nights period - would lead to darker skies and better viewing. Can any one enlighten me?