Winnipeg takes the prize, though, not only being close to 5 degrees more Northerly in latitude but also bearing the brunt of more persistent winds more typical of the prairies. Think wind chill. Winnipeg is (in fun) said to be synonymous with cold and foreboding winter weather. This region is considered to be the winter playground for the snowmobilers, cross country enthusiasts, ice fishers etc. from the urban South ... Toronto and surrounds. 'Cottage country' in summer. I am lucky.
Now, there are those Westerners, like my dad from Saskatchewan, who claim no matter how cold it may get in the West, it is a dry cold and does not 'feel' as cold as winter in the more humid Eastern provinces. There is likely a lot to say for this observation. At least here, our climate is tempered by the Great Lakes, even inland where I live. Lots of water courses and lakes and hilly geography carved out by glacial action. Algonquin Park is just NE of me here.
Climate zones are critical for our choice of perennials here, for example. I'm in 4a generally and may have some 4b, even 5 ... niche locations on this South-facing hill property. I consider a hardy for zone 3 to be a shoo-in
(and probably originating in Siberia!) Also, I'm in a shallow river valley.
I wonder do gardeners in warmer climes use their zones as guides for planting perennials - perhaps for the heat?