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> Who says they survive cold winter climates?

Anyone who put even a minute of effort into looking up the well-researched and publicly available information on the topic rather than defaulting to ignorance could have told you this.

Insects have numerous different strategies to make it through cold winters, either as eggs, larvae, or adults. Some can tolerate partial freezing, some lower the freezing temperature of their bodies in order not to freeze at subzero temperatures. These are combined with finding shelter inside tree stumps or bark, under leaves or rocks, or even underwater, granting them a layer of insulation and protection from the wind and the worst cold.

Here's a good starting point for those interested https://en.wikipedia.org/wiki/Insect_winter_ecology#Cold_tol...