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December 2025 General Discussion


Brian D
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this was a confirmed tornado in Illinois

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...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CST FOR
SOUTHEASTERN MACON COUNTY...

At 318 PM CST, a confirmed tornado was located about 5 miles west 
of Mount Zion, moving east at 45 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

 

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I got 1"/27mm of rain yesterday. 

With the intense LES of 8"/20cm and awesomely my new years eve was charged up to 10"/25cm, will be the most intense winter wx for the final days of any year I've ken. Tomorrow 7cm and still breezy has a sum of 20" in the next 72 hr!! Consensus still giving me snow every day til Jan 6.

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Another record that fell was Toronto (city) daily rainfall and precip record for December 28th.

The daily precip record (28.7 mm) from the 1968 snowfall record of 11.3" was broken in 2025 by the 37.3 mm rainfall (1.47") that also broke the (relatively weak) 1863 rainfall record 0.52" (13.2 mm). Many other daily rainfall records are closer to the 2025 mark and it was not an all-time monthly record, that being 1.95" (5th 1870). The only other higher daily records were 1.81" (3rd, 1841) and 1.75" (9th also 1841), so it can be said that yesterday's rainfall was the fourth greatest daily amount in December, and largest in 155 years. It barely exceeded a fall of 1.46" on the previous date in 1942. (The 1841 events may have been over longer intervals than the calendar day, some 1841-42 data are listed as cumulative totals). 

Unlike U.S. climate records as available, Canadian daily climate records separate out rain and snow when various amounts fall as part of a daily precip total. Unfortunately since 2017 Toronto city has only reported daily precip and snow on ground so I now need to apply conversions myself to the data, but Toronto airport still has the full breakdown and I believe all or nearly all of the precip on the 28th was rain, some probably freezing rain at first. There had been a snowfall of about 5-6 inches on Boxing Day.

The 1968 daily record snowfall added several more inches on the previous day and was around 14" in total. I recall the event from my own observing near Toronto and it was a sleety kind of snowstorm with some ice pellets in the mix. 

Today's record daily snowfall of 15.0" is from Dec 1855! The airport daily record is probably a lot lower because its data only begin in 1938. Today's daily record rainfall was 1.34" from 1940.

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11 hours ago, donsutherland1 said:

St. Louis had its fifth biggest daily temperature range on record yesterday, as the mercury plunged from a December monthly record 78F (25.6C) to 22F (-5.6C). That was the largest daily temperature range on record for December.
image.jpeg.3d6a7c090771563d352171259e213786.jpeg

Extremely unusual values of 50 to 54 degrees below yesterday, in Missouri

UMeFQRB.jpeg

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11 hours ago, donsutherland1 said:

St. Louis had its fifth biggest daily temperature range on record yesterday, as the mercury plunged from a December monthly record 78F (25.6C) to 22F (-5.6C). That was the largest daily temperature range on record for December.
image.jpeg.3d6a7c090771563d352171259e213786.jpeg

Thanks for the update, Don. As one might expect, a MASSIVE outbreak of "weathergamis" occurred yesterday (and undoubtedly today as well). I've been following this account for a while and this is, by far, the most I've seen.

 

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