The other day, it got down to 3 degrees F, here. At the same time, the wind was gusting at our house up to about 30 mph. I was outside in that for a little while, then hurried back in the house.
We worried about our dog, who lives outside in a kennel next to our house. Siberian Huskies are made for the cold, but how cold can they handle for extended periods of time. A quick internet search revealed that they are good down to -50 or -60 degrees F.
I ran across this wind chill table. According to the table, we reached 30-35 degrees below zero. It felt like it!