Most extreme or quickest temperature change you've experienced?

[SingingAnalyst]

In the afternoon on March 8, 2000, in southeast MI, it was 80F. By the morning of March 11, it was 26F-- a 54 degree drop in 60 hours.

Anyone live near Spearfish, SD? The Chinook wind picked up and just as suddenly died down, resulting in the following temperature readings on Jan. 22, 1943:

7:30 AM: -4F
7:32 AM: 45F
9:00 AM: 54F
9:27 AM: -4F

I've used the above temperatures to teach my students about piecewise functions.

[GeorgiaModerate]

I remember a few years ago when a cold front came through after some unusually warm spring days.  Went from the low 80's that afternoon to waking up to 33 the next morning.

[Zohranism is OUR future]

There were two times.

First one I actually remember because it was last year (actually two years ago lol)
The temperature was at 83 degrees one day, and that evening it fell to 29 degrees. By the next day it was 13 degrees.


Second one is one which happened when I was a lot younger when the temperature dropped 76 degrees over two days.

[Penn_Quaker_Girl]

I remember driving from Galveston, TX (70*F) to The Woodlands (32*F) several winters back.  The two locations are about 90 minutes apart. 

Was definitely not anticipating having to trade shorts for leggings.

[100% pro-life no matter what]

One night in December of 2015 or 2016, I remember turning on the TV news and seeing that it was 73 in Nashville and 42 in Clarksville (like 40 miles from Nashville), right as a sharp cold front was moving through.

The most extreme difference between the high and low I've ever experienced actually had nothing to do with a front.  One April day during my senior year at Vanderbilt, the morning low was 30.  Under bright sunshine, virtually no humidity, and a strong Southern breeze, the afternoon high made it to 80, a whopping 50 degrees warmer than it was early that morning.

[Cokeland Saxton]

1) Indianapolis, Indiana, March 22, 2014. It was 70F (21C) at mid-morning, and by that night, it was well below freezing with some 6" (15 cm) of snow on the ground.

2) Also Indianapolis, December 2010. It was in the 60s on a Saturday. The next day, it was in the 40s and pouring rain. Monday was nearly 20 below zero, with a windchill of nearly -40 and a whiteout blizzard.

[brucejoel99]

Direct flight from Orlando to Burlington in March.

Basically the same for me: a direct flight from Fort Lauderdale to Boston in February.

[Horus]

Probably after one of many childhood flights between Cleveland and Lauderdale.

[Lexii]

On my trips to Northern parts of Argentina
There quite a few places in Northwestern Argentina and the Chaco region where dramatic temperature changes within a single day and it's nothing unusual, I had many days where it was -2~5°C (30-40F) at  early morning and 30~35° (85-95) and extremely sunny at noon, during winter

[dead0man]

I don't know exactly, but it goes from the 80s to the 20s sometimes here over the course of a day and a half.  I spent a winter in San Antonio Texas once and I don't know what the temps were, but I know it was below freezing in the morning and was hot enough to sweat in the afternoon on more than a few occasions.

[Meclazine for Israel]

I work in 120 deg F heat at the moment. After work, I swim in a pool that is 75 deg F.

[DabbingSanta]

Driving in early June. 90 degrees when I left my house late in the morning, five hours and 300 miles later I get out to fill up and its only 48 degrees.  I was in shorts and a t-shirt and running the AC full blast, totally unaware.

Flying, definitely Toronto to Cancun.  30 degrees and snowing, wearing long sleeves and a sweater when I left Toronto.  Cancun was 90 degrees, sunny, and very high humidity.  It felt like walking out into a sauna.

At home?  Never seen anything quite like that although I do remember a heat wave in March with temperatures around 80 followed by a snowfall. That might have been over two or three days though.

[🥥🌴]

Belgium has a very temperate and boring climate, influenced by maritime weather patterns. North Dakota and West-Central Canada have an extreme climate.

[muon2]

Driving up mountains are a good way to get a quick temperature change. In 2018 I felt a 40 point temperature drop in less than an hour from the north coast of Maui to the top of Haleakala at 10,000 feet. An early summer drive over the Front Range can go from 90+ in Denver or Colorado Springs to snow on the ground at the passes.

[Zohran "The Sword of Islam" Mamdani]

After thinking about this for a while, I think mine would be in the caves of the Lava Beds National Monument. The surface was about 90 degrees, but after a half-hour descent into the caves, I could see my breath.

[Rand]

122° in Kuwait
-24° in North Dakota

[Santander]

When my wife found out about something I hid from her. I went from cold to sweating bullets in less than a second.

[Mexican Wolf]

Definitely not the quickest, but flying home from Kaua'i to Philadelphia back in January 2017:

It was 77 degrees F when I boarded the plane in Kaua'i.

It was 0 degrees F when I left the Philly airport.

[Mike Thick]

One time when I was driving through the Santa Ynez mountains towards the coast, the temperature went from 97 to 65 over the course of maybe five miles.

[Tokugawa Sexgod Ieyasu]

Once in the winter of 2013-2014 the temperature went from 20 to 65 from one day to the next and the snow started literally evaporating directly into fog. The next day it was back down to about 30.

Since people are discussing flights up-thread, Rome to Boston in late October a few years ago was also pretty dramatic.

[politicallefty]

Between indoor and outdoor or just outdoor over time? I love the summer temperature differentials in Sacramento. In can be 100-110ºF in the day, but it'll drop 35-45ºF overnight. That's the beauty of a dry heat and no urban heat sink like Phoenix or Las Vegas. I've also flown from places where it's hot to where it's snowing.

[Velasco]

A direct flight  from Las  Palmas to Berlin some years ago. The change was about 30°C, from 20° to -10°. I am accustomed to a mild climate with very light temperature changes during the day

[25 Abril/Aprile Sempre!]

I have no idea really, but probably when I visited Moscow in 2017 with my father.
More than in one occasion it started snowing and the temperature must have reached -5 °C or so, and in each case we were like that until entering a restaurant or a bar or the underground, all of which places where the temperature was probably around 20 °C.
For the record, it wasn't winter in full swing. It was mid-April.

[Hammy]

We've had some fast moving fronts in Georgia on numerous occasions that have dropped the temperature from 70s to 40s in the matter of an hour or two, and I remember some severe weather that has likewise led one hour temperature drops of around 25 degrees (usually from 90 to 65)