When I woke up at 4 AM for my shift, the weather was the following:
Temperature: 9°F
Sky: Partly cloudy
Winds: NW at 20 MPH, gusting to 35 MPH
Wind Chill: −10°F (easily verifies the Wind Chill Advisory criteria of −5°F)
It was just 7°F, which happened to be the low this morning, with a wind chill around −13°F when I launched my balloon with help from another person at 6 AM. The winds were gusting up to 40 MPH at that time, so it felt even colder as you're supposed to use sustained winds to compute the wind chill, not the highest wind gusts.
I have never been so cold in a long time.