what is the coldest day, on average, of the year? (2013, normal)

[chicagogeorge]

Originally Posted by Crunch41

I'm guessing the -82F is from the old formula.

Yes it is of the old formula. But....

25 BELOW ZERO AT CHICAGO...THE THIRD ALL-TIME COLDEST TEMPERATURE EVER RECORDED FOR THE CITY. WINDS ON THE MORNING OF THE 24TH RANGED FROM 29 TO 41 MPH

http://www.crh.noaa.gov/lot/?n=Dec_wx_trivia


A -25F temps with a 41 mph wind gust would create a windchill of -64F/-53C under the new formula. That would be under the Winnipeg windchill, but I'm not sure how Canada calculates wind chill factor. If it's anything like the "humidex", then imho it would be over inflated.

[Bottletree]

Originally Posted by chicagogeorge

Yes it is of the old formula. But....


December Weather Trivia


A -25F temps with a 41 mph wind gust would create a windchill of -64F/-53C under the new formula. That would be under the Winnipeg windchill, but I'm not sure how Canada calculates wind chill factor. If it's anything like the "humidex", then imho it would be over inflated.

Glossary

[Ariete]

On average, it's probably in mid February.

Here's the coldest day/night the last five years, based on the 24h mean temp:

This year so far: 18 Jan, -13.1C/-21.5C

2012: 19 Feb, -16.6C/-21.3C
2011: 19 Feb, -13.3C/-25.4C
2010: 2 Jan, -16.5C/-21.0C
2009: 18 Dec, -9.7C/-20.8C
2008: 5 Jan, -5.1C/-8.2C

[Mac15]

I will do mines too.

2013: 1c
2012: 1c/ -5c
2011: 0c/-6c
2010: -10c/-18c
2009: -3c/-7c
2008: 2c/-2c

[kronan123]

here is a pretty cool graphic touching on this subject. the average daily mean temps between 1722-2003 for uppsala, sweden for the period dec-mars. the shape is kind of weird.

Ã…rets kallaste dag | Meteorologi | Kunskapsbanken | SMHI

i'll translate the conclusion to english

"Statistically, it is not possible to set a date safer than the so calculated minimet falls sometime from the last days of December to about February 25."

the scatterplot at the bottom of the page shows the date for the abs-coldest daily mean temp for each year during the same period.

[Ariete]

Originally Posted by kronan123

here is a pretty cool graphic touching on this subject. the average daily mean temps between 1722-2003 for uppsala, sweden for the period dec-mars. the shape is kind of weird.

Ã…rets kallaste dag | Meteorologi | Kunskapsbanken | SMHI

i'll translate the conclusion to english

"Statistically, it is not possible to set a date safer than the so calculated minimet falls sometime from the last days of December to about February 25."

the scatterplot at the bottom of the page shows the date for the abs-coldest daily mean temp for each year during the same period.

I don't see that surprising. The pattern is pretty much the same here. Either early January or mid February. But the absolute coldest day may occur anytime between Dec and Feb. Not unheard of it being in early March either.

[dunno what to put here]

Our coldest day this year/winter was in mid-January, but the coldest day in March was colder than any day in December or February.

Our coldest days this year (mean temp):


16 Jan -5.4
17 Jan -4.7
11 Mar -2.5
15/25 Jan -1.9
21 Jan -1.3
22 Jan -1.1
23 Mar -1.0

[Ariete]

Originally Posted by dunno what to put here

Our coldest day this year/winter was in mid-January, but the coldest day in March was colder than any day in December or February.

Yeah. Though the coldest day was in January, the coldest average low was in March.

[dunno what to put here]

^^ same here. March also had 2 ice days, compared to 0 for February and December.

[Ariete]

Originally Posted by dunno what to put here

^^ same here. March also had 2 ice days, compared to 0 for February and December.

March was so sunny that the temps often climbed above zero though nights were frigid. Still the figure is depressing. Ice days 2013:

Jan: 20
Feb: 13
Mar: 15



For comparison, ice days in March the previous years:

2012: 4
2011: 1
2010: 8
2009: 9
2008: 8
2007: 0