what is the coldest day, on average, of the year? (ice, recorded)

[Kaleetan]

January 15.

[Mac15]

End of december

[dunno what to put here]

No idea, but I bet it's in late January.

[chicagogeorge]

Yes late January for us. January 17-20th are the coldest days

[wawa1992]

Wunderground says January 8th-12th, with a high of 46 and low of 28. From personal experience, I'd say January 10-20 and February 1-10.

[Caleb Yeung]

Late Jan here.

[Bottletree]

Here is the month data for our coldest, it occured in December.

look at Dec 24

Daily Data

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Then here is our coldest windchill, look at 8:00 it occured feb 1 1996

http://climate.weather.gc.ca/climate...ear=1996&Day=1

[Mac15]

For god sake -40c lol.

My annoying uncle told me it hits -40c there every year.

[chicagogeorge]

Originally Posted by JetsNHL

Here is the month data for our coldest, it occured in December.

look at Dec 24

Daily Data

Wow that's pretty damn cold!

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Then here is our coldest windchill, look at 8:00 it occured feb 1 1996

Hourly Data

I don't know if Environment Canada measures wind chill different then NOAA (which they changed their formula a while back), but I am surprised that our lowest wind chill factor is lower than Winnipeg.

-82F/-62.3C on December 24, 1983
Chicagos Official Records

[Crunch41]

I'm guessing the -82F is from the old formula. Weather Underground shows a lowest wind chill of -58F for O'Hare and -49F for Midway on that date.

Edit: it is the old formula, minus 57 by the new formula.

http://articles.chicagotribune.com/2...rmula-mph-wind

"It would require a temperature of minus 41 degrees with winds of 30 mph to equal the minus 82 wind chill record under the new formula."