The Met Office has issued two mountain weather hazard warnings for Snowdonia, also known as Eryri, today.
The first is for a "severe chill effect", meaning winds can feel colder than the actual temperature.
"This effect will be enhanced in rain or wet snow. Without protection, prolonged exposure could result in frost nip or frostbite on exposed parts of the body and/or hypothermia," the Met Office said.
This is key, no matter how experienced or sheltered you are, they're clearly making a point that it's too cold to camp there.