It certainly appears so. Not sure if there are many populated places in the area where it’s snowing (I looked at a map and put in Schefferville, Quebec into my iPhone weather app and it showed that it was snowing and 36 there, though admittedly the iPhone app can be terrible with ptype). Their Wikipedia page does show a normal July snowfall of 0.1cm, so that would answer the question of whether or not it’s unprecedented.