Just because you drink them year round, doesnt mean most people do. They dont brew them in the summer because they cant sell them enough to make it profitable.
You definitely have a point there about only having ipas at a brewery. IPA is the easiest beer to make, and the easiest beer to hide any imperfections. 1 of our 2 main breweries in town basically only does IPAs. Took them like 5 years until they did something that actually was good and not an IPA
Canadian, probably? Niagara is on the usa/Canadian border