Worst conditions I ever shot in was probably about 55 years ago when I was in college. A friend and I went out to the local rifle range shooting our big centerfire rifles, and it was lightly sleeting. No idea of how cold it was, but it was cold for N. Louisiana. We would shoot a bit, then warm up in the range officers hut a bit and shoot some more.It's still chilly here, mid 40's and humidity was just reported on news as 98%, so not fun outside.
That right there is what northerners don't understand when us southern folk complain about being cold... anything below around 45* when humidity is that high is cold. It's a different cold.. it's wet and it gets inside you.