That is a Swamp Darner, and while I was not near a swamp, they are a common species that you can find wandering relatively far from any wet forest area. This could even include suburban areas with enough water in the form of small ponds. They are also a migrant species which opens up nearly the entire region to their presence. You know we're in a particularly nasty heat wave when even a dragonfly feels the need to try to beat the heat...
Photo by Scott Kruitbosch © Connecticut Audubon Society and not to be reproduced without explicit CAS permission