More of How Weather Affects History

5 More Times That Weather Shaped History

Mount Tambora Eruption

The dust from the 1815 eruption of Mount Tambora in the Dutch East Indies (now Indonesia) caused a worldwide lowering of temperatures during the summer of 1816, when the Almanac, legend has it, inadvertently but correctly predicted snow for July.

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Did you know that weather often shapes the course of human history? Find out about five times when weather events affected historical events!

Most of us know that it was a change in the climate, caused by an extraterrestrial impact or a massive bout of volcanism, that led to the extinction of the dinosaurs, rise of the mammals, and, eventually, emergence of humans. But, since that time, weather and climate have also played a critical role in numerous events that have dramatically changed the course of human history. Here are—in my opinion—another 5 of the top 10 (we presented the first 5 last month):

Check out the other 5 times that weather affected history!

1. 1812: Napoleon Defeated by Russian Winter

In 1812, Napoleon assembled the largest army Europe had ever seen, with more than 600,000 men, to attack Russia and add it to his empire. His soldiers quickly captured Moscow, but as they marched away with their spoils, the severely cold Russian winter arrived, with temperatures dropping as low as 40 degrees below zero (in both Fahrenheit and Celsius—40 below zero is the temperature at which the two scales have the same reading). As many as 50,000 horses died from the cold in 1 day and only 150,000 of the soldiers made it back to France, the rest succumbing to the cold. It was the beginning of the end for Napoleon’s empire, and heralded the emergence of Russia as a power in Europe.

2. 1815: “The Year Without a Summer” Leads to Famine, Cholera, Bicycles, Mormons, and Frankenstein

Earth was experiencing the concluding decades of The Little Ice Age in a period of relatively low solar activity from 1790 to 1830 known as the Dalton Minimum. May 1816 in particular had the lowest sunspot number (0.1) to date since record-keeping on solar activity had begun. From April 5–15, 1815, (what is now) Indonesia’s Mount Tambora produced the world’s largest eruption since a.d. 180, which ejected immense amounts of volcanic ash into the upper atmosphere, where the jet stream carried it around the world. The result was a further reduction in solar irradiance that brought record cold to much of the world during the summer.

The unusual cold played havoc with agricultural production in many parts of the world, resulting in crop failures, dramatic increases in food prices, famines, cultural disruptions, and epidemics of cholera and other diseases. Rapid, dramatic temperature changes occurred frequently, as temperatures sometimes went from above-normal summer levels to near freezing within hours. U.S. grain prices at least quadrupled, and oat prices increased almost eightfold.

Elsewhere around the world, famine, riots, arson, and looting occurred in many European cities, while China suffered from massive crop failures and disastrous floods and a disruption in the Indian summer monsoon spread a cholera outbreak from a region near the River Ganges all the way to Moscow.

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“The Year Without a Summer” also had cultural effects:

  • The lack of oats to feed horses likely inspired German inventor Karl Drais to research new ways of horseless transportation, which led to his invention of the precursor to the bicycle.
  • Many Americans left New England for the Midwest, accelerating the westward movement of the American people. Vermont alone had as many as 15,000 people emigrate, including the family of Joseph Smith, who moved from Norwich, Vermont, to Palmyra, New York. This move may have made possible the publication of the Book of Mormon and the founding of the Church of Jesus Christ of Latter-day Saints.
  • In June 1816, Mary Shelley was forced by the weather to spend her Swiss holiday indoors with her literary companions, where to pass the time they decided to have a contest to see who could write the scariest story. The result was the novel Frankenstein; or, The Modern Prometheus.

The Old Farmer’s Almanac also might have predicted “The Year Without a Summer”! Find out about this legendary Almanac story and how “The Year Without a Summer” occurred.

3. 1588: Weather-Fueled Defeat of Spanish Armada Propels England to World Dominance

The defeat of the Spanish Armada in 1588 has been called one of the most decisive battles in Western civilization. In 1588, King Philip of Spain sent an armada to collect his army from the Netherlands, where they were fighting, and take them to invade England. However, the wind didn’t cooperate with his plans.

After about 2 weeks of battle, the Spanish fleet had been badly damaged and began to make a retreat. As the Armada reached the latitude of Ireland, it encountered a major hurricane. Hammered by the wind and sea, at least 24 ships were driven ashore on the Irish coast, where many of the survivors were killed by Queen Elizabeth’s troops.

The defeat of the Spanish Armada was the key event that propelled England to become the world’s dominant power for the next three centuries.

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4. 1944: Difference in U.S. and German Weather Forecasts Critical for D-Day

Perhaps the best known and most important weather-related event of World War II was Hitler’s failed Russian invasion of 1941. He waited until June 22 to start the invasion, expecting a quick victory, but when Moscow held out until winter, the severe cold defeated Hitler just as it had defeated Napoleon more than a century earlier.

Less known, but also critical, was the influence of weather on the June 6, 1944, D-Day invasion of France across the English Channel that gave the Allied forces a crucial foothold in Europe, helping lead to Germany’s defeat by the following May.

Critical decisions about when to send the Allied forces across the channel were based on weather forecasts compiled by Allied meteorologists, which predicted a break in the unfavorable weather on June 6.

In addition, the Allies had broken Germany’s secret Enigma code, which enabled them to gather and use weather observations from German territories in making their forecasts, as well as to see that the Germans had forecast weather conditions to remain unsuitable for an Allied assault on June 6.

This gave the Allies’ meteorologists extra information to advise that conditions would be marginal but sufficient to launch the invasion.

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5. 1776: Fog Allows Washington to Avoid Defeat, Keep American Revolution Alive

The American Revolution almost ended with defeat by the British in the summer of 1776, when Gen. George Washington was leading 19,000 troops in the defense of New York City that summer after the British had increased their troops on Staten Island to 40,000.

Not sure where the British would attack, Washington left half of his forces in lower Manhattan and moved the rest to Brooklyn and Queens. On August 27, the British began an attack on Washington’s Brooklyn and Queens positions, charging the American defenders with overwhelming force.

Under the cover of darkness and with the help of some locals, the Americans managed to slip away unnoticed to Manhattan via the East River, with General Washington himself one of the last to retreat to safety. The British, stationed only a few hundred yards away, were totally unaware of the movement because of a dense fog that had formed in the early hours of the morning.

If not for that fog, Washington likely would have been captured and the American Revolution would have ended in defeat, with its leaders hanged as traitors.

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Find out about the weather history in your area! Also, check out some distinct times when weather shaped American history.

Michael Steinberg, Old Farmer's Almanac Meteorologist

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