Not that long ago London (Ontario not UK) had 1.5 meters of snow in a 36 hour period...4 inches is what we call a "dusting" of snow in most parts of Canada...
Speaking of snow in Canada, on our honeymoon in the middle of August 1992 we had to drive from Lake Louise to Waterton National Park through the biggest snowstorm in decades, in a rented Ford Taurus and summer tires. The roads were so treacherous with deep snow, and we could barely see the road markers sticking up through the snow at the side of the road. Somehow we made it to a hotel outside of Waterton National Park.
We'd started on a 10 day train, driving, backpacking trip through the Canadian Rockies - beginning in Denver with the Oregon Trail Amtrack to Seattle, then renting a car there and driving, with stops in Vancouver, Lac Le June, Jasper and Banff, Lake Louise, Waterton National Park, Glacier National Park, Jackson Hole WY, and the Grand Teton and Yellowstone National Park, returning the rental car in Denver.
Our train hitting a teenager on his bicycle while on a bridge in Oregon on the second day, and having to perform CPR in a ditch (me Doctor, wife an OT) so that he would live long enough for his parents to take him off life support, should have been a sign that our honeymoon was in jeopardy.
But we pushed on, and put the tragedy behind us as we drove through mountain passes, paddled canoes, rode horses, hiked over Nigel Pass and camped, rode a snow cat over the glaciers, saw dozens or hundreds of waterfalls, and sat in the hot tub at the resort at Lake Louise while the snow began to fall. As we drove away from Lake Louise the snowfall became heavier and heavier, and I'd only had one season of winter driving experience, having moved to Colorado from Texas the year before. I found that going slow and steady it was the only way thru it, rather than turning back. Mind you, this was the days of paper maps and no GPS to help keep us on course!
We couldn't camp in Waterton and Glacier National Parks as planned, with so much snow, and we were lucky to find a hotel with an unclaimed honeymoon suite, with hot tub in the middle of the room and mirrors on the ceiling (scary and low class but clean). We still continued on to Jackson Hole and Yellowstone/Grand Tetons after waiting out the snow, but at that point we decided to stay at the lodge at Jackson Hole and a cabin in Yellowstone, rather than camp.
Sometimes I'm still amazed that we made it through that storm, which made it down to Montana and set records (had not snowed in August in 100 years), but I don't have much info on the impact it had in Canada. This article says Glacier National Park got a foot of snow during the August 1992 snowstorm, and it was even worse farther up north in Waterton National Park -
https://weather.com/forecast/news/first-snow-august-montana-glacier-national-park-20140822
Also
http://www.krtv.com/story/36194207/august-snow-in-great-falls-flashback-to-1992-video
Also
https://www.weather.gov/media/wrh/online_publications/TAs/ta9419.pdf