Diseases, viruses and germs will survive the (warmer) winter. The best thing about our winter climate in this country is when we get cold winters it kills a lot of those things.
It's our best guess at what we think the character and personality of the winter in Canada will be like. It's not saying whether it's going to be a white Christmas, or whether there's going to be a January thaw, or what voting day will be like weather-wise. It's none of that.