For fun I've written a script to calculate the site windchill now the wind has kicked up. It uses the NOAA formula. The script is called windchill

david.barker@zotws2: windchill
EX temp 20.1(degF) wind 09.0(mph) windchill 09.6(degF)
MX temp 19.4(degF) wind 09.0(mph) windchill 08.8(degF)
CS temp 21.2(degF) wind 08.0(mph) windchill 11.7(degF)
MY temp 19.3(degF) wind 08.0(mph) windchill 09.4(degF)
EY temp 17.8(degF) wind 08.0(mph) windchill 07.6(degF)
 
wind chill average over site 9.4 degF