Will these boots be too warm to wear in the summer months?
I want a pair of versatile boots that I can wear predominantly in spring, summer, & autumn around the MD, VA, NY areas. Trail runners seem to be a good idea too.

I walk in Hong Kong which is a warm, humid semi-tropical climate (same latitude as Cuba) and have not had a problem at all.

Well there are a couple of things you should also address. Where will you be hiking, meaning terrain and climate. How hot do you expect it to be, how wet, dry, steep, etc. I've noticed waterproof boots are great for cold weather, but not so much for hot. In the warm months I like using lightweight super quick drying boots so I can walk through creeks and enjoy cooling off, then hiking them dry. Go for something with light mesh uppers and a medium weight rubber sole. To be specific, Keen makes a good boot that offers no break in time, is lightweight and quick drying, but their craftsmanship is crap. Be ready to only put in about 300 miles for their boots before they fall apart on you. I took the Keen Voyageur on the AT with me and had to replace them after only 400 miles, and the customer service they offered was shite. I did like that I didn't need to break them in though. This is neither here nor there though. Best advice, go for something light and fast drying. I just use trail runners now though, even in the mountains, even while hiking with a 40lb load on my back. I think trail runners are the way to go.