It snowed several more inches today and it is currently 1 degree Fahrenheit (-17 degrees Celsius).
Can you go outside in that? I have never experienced that temperature before.
It is nice right now 31.5C. But next Wednesday is forecast to be 40C again. 
I will stay inside that day.
Sure, you can go outside in zero degree Fahrenheit weather with snow and be fairly comfortable if you are wearing a coat and snow boots.
The worst conditions are what we get the most of here; the temperature hovering a little above freezing with no sun, plenty of wind and constant light rain that lasts for days. When it's very cold, it's also very dry, which makes it very easy to keep warm, but when it's wet, everything gets soaked, even if you've got a full shell of goretex on. When the outside of the goretex gets soaked, as it inevitably does when exposed to rain for long enough, it stops being breathable and your clothes very quickly get damp and all your heat is sapped away.
It's impossible to use down jackets here for anything serious, since they'd get soaked and would be useless, even the ones with goretex outers, and while wool doesn't become quite as useless when wet, it still loses a lot of it's insulating ability in damp conditions. Also, the moisture in the air greatly increases the air's ability to carry away heat, so the wind chill is particularly severe here. I'd take a blizzard over rain any day, and the colder the dryer the warmer, at least until you get to silly-cold temperatures and assuming you have the right gear.
