What does this mean? I'm in Australia so I would expect Sept-Nov.
But since I've only ever heard of American companies use seasonal typed release dates, my first instinct is to assume this is an American site and therefore American Spring - but Googling 'spring season usa' tells me Mar-May. And we are already in May.
So then I have to scroll to the bottom of the page to see what region this might be in, and it has got Australia selected. I change to UK, scroll to the top, and it has changed to autumn.
So, it is actually Australian Spring. That actually surprises me since most pages like this would not be updated to reflect my region, and so I would never expect this kind of text to be localised.
Let's just all use unambiguous wording and units :)