You can’t fool around with winter weather if you live in places where it is below freezing for a good portion of the year.
I have heard that in some cases it can happen in under half an hour if the sudden drop in temperatures is severe enough.
You’ll start feeling confused and tired, which is a recipe for disaster because you might be inclined to lay down and sleep. In a situation like this, you could easily die in your sleep and never wake up. All it takes is for your body temperature to drop below 95 degrees fahrenheit. I read once that some people die every year from simply falling on their basement floors, and not from the fall itself. If you can’t get back up in enough time, the cold basement floor will chill your body from head to foot. Before you know it, you’re passed out and headed to your grave in under an hour from sheer coldness alone. Spokane is exceptionally cold in the winter. Whether you live near the Spokane Falls on the Spokane River or as far south as Moran Prairie, you need a good heating system and some kind of supplemental heating system on top of that. What if you lose power? What if you run out of fuel during a blizzard? I use a wood stove to heat my house in Northwest Spokane along with my central furnace, but some have generators for power outages instead. As long as you have some means of getting heat if your primary heating system fails, you should be fine. Spokane isn’t any colder than places I’ve lived in the northern midwest, but it depends every year as climate patterns shift.