Been there twice...always a delight.
Even in the summer months, it’s a spectacular sight.
I’ve been to the Canadian side once when I was 16, and stood in front of Fredrick Church’s Painting of Niagara at The Corcoran Gallery of Art twice since. I’d go back to the Corcoran again to see the painting. Once you have seen and felt the real falls, just standing in front of the painting brings everything back, except a trip across the border.