Freezer Bowl Air temperature was −9 °F (−23 °C), but the wind chill, factoring in a sustained wind of 27 miles per hour (43 km/h), was −37 °F or −38 °C (calculated as −59 °F or −51 °C using the now outdated wind chill formula in place at the time). http://en.wikipedia.org/wiki/Freezer_Bowl
"The Ice Bowl" −15 °F (−26 °C), with an average wind chill around −48 °F (−44 °C); http://en.wikipedia.org/wiki/1967_NFL_Championship_Game#.22The_Ice_Bowl.22