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What Will Be the Coldest Day in Your City This Year?

Crunching the numbers on the geography of winter's worst weather.
relates to What Will Be the Coldest Day in Your City This Year?
NCDC/NOAA

Attention, employees who wish to time their "sick days" with the most frigid, butt-chapping weather: Want to know what portion of your calendar to mark off with a big, red X?

It's impossible to identify the exact dates for the coldest time of year, as weather changes constantly, but we can make an educated guess looking back over decades of temperature records. And that's what the folks at NOAA's National Climatic Data Center have done with this illuminating map of bottom-barrel temps throughout the U.S: