When Is It Too Cold to Run Outside?

The International Ski Federation currently follows a very specific set of rules that dictate how cold is too cold for ski racing, saying races must be delayed or canceled if the coldest point of the course is colder than -4 degrees Fahrenheit (F)/-20 degrees Celsius (C).

https://www.irunfar.com/when-is-it-too-cold-to-run-outside