The wind chill tonight is lovely! Gusting to 50 mph at 22F to begin with.
Here's a digital wind chill calculator, no software here:
"PROM Converts Weather Data for Wind-Chill Index Display, Electronics, Jan. 5, 1978, p 158-159."
Looks like there's an error on the schematic, both the nor gates and or gates are labeled LS02, or they forgot the dots on the left.