Change the weather on one day, 1900-present

But it would keep Britain in the grips of a food shortage.

By April of 1917, existing food stocks within the U.K. were only at about six weeks of consumption; American entry into the war quite literally pulled off a last second save on this. Presuming severe crop failure due to poor weather, as occurred in Germany in 1916, then it's entirely likely the United Kingdom is forced out of the war by the Winter of 1916-1917. At that point, the Russians and French both will quickly follow.
 
August 9, 1945: Clear skies allow the Enola Gay to drop the Fat Man atomic bomb on the city of Kokura.


Bockscar.

I'll throw one out there: In October 1919, an extended period of bad weather allowed White Sox pitcher Red Faber to fully recover from the flu. With Faber healthy and in the rotation, mobster Arnold Rothstein abandoned his scheme to fix the World Series, and the White Sox won five games to two. Infielder Chick Gandil was later released due in part to suspicion that he attempted to broker a deal to fix the Series.

The big news in the offseason was the White Sox trading Shoeless Joe Jackson and $80,000 to the Red Sox for Babe Ruth.

Ruth was eventually traded to the Browns during a contract dispute. White Sox owner Charles Comiskey was a notorious cheapskate and also unloaded Ed Cicotte, Lefty Williams, and Buck Weaver during the 1920s. But his stinginess had one positive effect. In an effort to cut payroll during the Depression, as well as take advantage of the South Side's changing demographics, Comiskey signed Cool Papa Bell, Satchel Paige, and Josh Gibson in 1933. The Pale Hose went on to win the 1933 World Series against the New York Giants, and most teams integrated by 1939, with the Braves, Phillies, and Red Sox as the only holdouts.
 
During the afternoon of May 31st 1916 the weather in the Eastern North Sea clears allowing Jellicoes Grand Fleet to decisively engage the High Seas fleet for several hours with the heavier and more numerous guns of the 'faster' and well drilled Grand fleet rapidly gaining the advantage before darkness allows the survivors to scatter and escape.

Half the HSF surface fleet's capital ships are lost with nearly all the remaining capital ships badly damaged with several of the survivors having to run aground near the Jade

Despite the loss of 4 Battlecrusiers and 2 Dreadnoughts along with many Crusiers and Destroyers and many ships of the Grand Fleet badly damaged - some requiring months of repair work - the battle is a clear victory for the Royal Navy and Entente

Shocked by the loss of so many of his Battleships and Battlecrusiers the Kaiser has a heart attack and dies a week later - this causes a crisis among Germany's leaders and to confound the issue word quickly leaks to the troops and commanders at the front and morale collapses with an immediate impact to the ongoing fighting at Verdun.
 
A thin band of heavy squalls kept on rotating out of the North Sea on May 11, 1940. The band dump four inches of rain in under twenty four hours in a twenty mile wide and forty mile long stretch bounded by the eastern bank of the Meuse. The western bank had a fairly typical heavy spring rain, an inch or more in under a day but the eastern side's deluge raised the river level by several feet and slowed any and all traffic through the Ardennes.
 
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June, 1914, unseasonably cool wet weather in Sarajevo forces Archduke Franz Ferdinand to decide against traveling in an open car.

Gavarillo Princip feels the rains starting to pelt his face so he decides to return back to his room; his co-conspirators follow suit.

Joho :)
 
I feel that they would; good weather conditions are essential for a plan like that. Unless something broke to let people know that something was coming, they'd probably do it a different day with similar results.

Any close run election could have a different outcome if the weather in a particular district was different. Worse than OTL means that only the most determined come out to vote. Better weather can mean that more casual voters come out. The different demographics could change a key state or two.

Bad weather in Iran on November 4, 1979 could lead to a smaller group trying to storm the embassy--and failing.

There are a few districts of Florida that could presumably have had different weather around the 2000 Election and literally made the difference between Bush and Gore.
 

Nick P

Donor
Bad weather in Iran on November 4, 1979 could lead to a smaller group trying to storm the embassy--and failing.

April 1981, and there is no sandstorm over Iran. The US do not lose helicopters on the flight in and the runway at Desert One is not obscured by lying sand that causes visibility issues. The aircraft are not delayed and have spare fuel.
Operation Eagle Claw goes ahead with the minimum 6 helicopters deemed essential.
 
Here is a sports related scenario:

December 31, 1967, Green Bay Wisconsin

The day dawns bright, clear and a crisp 40 degrees.

With no extreme cold and little wind to deal with, the Dallas Cowboys roll to a 24 to 10 victory over the Green Bay Packers in the NFL Championship game. Don Meredith throws two touchdown passes to "Bullet Bob" Hayes, while Dan Reeves and Don Perkins combine for 150 yards rushing. Two weeks later, the Cowboys go on to defeat the Oakland Raiders 27 to 14 in Super Bowl II.
 
Who becomes governor?
sorry I thought I wrote it my bad. But Huey Long. In the 1924 election he he was close to becoming in second or first place, the vote was divided three way. He blamed the weather in 1924 for why he wasn't elected governor.
 
Cloudy skys occur over Regensburg on August 17th, 1943 and thus very little accuracy is achieved by the bombers of the 4th Bombardment Group against their targets. As a result, German fighter production at the facilities continues unhindered, allowing for an additional 1,000 to be produced and allowing for production of the Me-262s to be achieved several months earlier than IOTL.
 

Teejay

Gone Fishin'
17 December 1967 heavy rain, wind and high waves from a strong cold front hitting South Eastern Australia, make then Australian Prime Minister Harold Holt decide not go for a swim around noon of that day at Cheviot Beach about 95km from Melbourne.
 
November 9th, 1939, clear sky over Germany, somebody doesn't have to leave munich early to take the train to Berlin
 
Some really interesting ones in here. May 10/11, 1940 slipped my mind completely. Besides June 6, 1944, my first picks were November 22, 1963 and September 11, 2001. But it's very true that another assassination might have been averted by bad weather in Sarajevo. And averting that would probably have had even larger consequences, even if the Great War found a new way of starting. The fate of Kokura is another big one, and there are some interesting sports possibilities as well.
 
3rd February 1959

Conditions being slightly worse than IOTL, resulting in all air traffic in the Upper Mid-West being grounded at 10PM local time. The result is that Beechcraft V-35 Bonanza N3794N remains in the hanger all night. Buddy Holly, Richie Valens and J.P. Richardson end up having to take the bus.
 
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April 1865
It snows or there is very heavy rain in Washington, so Lincoln follows the wishes of his wife and abandons his plans to go to Ford's Theater.
 
March 30, 1981. Bad weather in Washington, D.C. allows the Secret Service to stop Hinkley before he can shoot Reagan. Most people imagine "what if" Reagan dies and Bush becomes president right then. But a foiled attempt means the government does not have to pause for a day or to. It means Margaret Thatcher, Leonid Brezhnev, and other world leaders do not have to pause their schedules to send condolences. It means fewer vocal Democrats will encourage their representatives to support Reaganomics out of sympathy. The differences might seem subtle, but they would be there.
 
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