"Where did you get the information that you posted?

I have seen a temperature change of 11 degrees Celsius during a 24 hour period and I thought that was extreme.

Where was the 30 C degree temperature change in 24 hours recorded? "

"On January 25th, 1916 residents of Browning, Montana were still adjusting to the largest 24 hour temperature change on record in the U.S.. On January 23rd and 24th, 1916 the temperature fell from a pleasant 44 degrees above zero to a bitter -56 degrees in 24 hours. That's a temperature change of an amazing 100 degrees in 24 hours and that's a record that still stands as the largest 24 hour temperature fluctuation in the U.S."

So, that's 55 C, but I guess 20 C is more common