That reading did not include the wind chill effect — which could hit negative 40 degrees (-40 Celsius), according to forecasters. It was even colder in Des Moines early Monday at 20 below zero (-29 Celsius) and wind chill dipping to 31 below zero (-35 Celsius). Des Moines city officials had closed a downtown outdoor ice skating plaza and said it won’t reopen until the city emerges from sub-zero temperatures. The wind chill dipped to 36 below zero (-38 Celsius) in Duluth, Minnesota, a city known for its bitter cold winters. The wind chill was expected to be about 9 below zero (-13 Celsius) by the time of the event at noon.

Source: National Post January 01, 2018 06:15 UTC