Effect of the 1816 "Year without a Summer" on a surviving Napoleonic Empire

Deleted member 97083

The 1816 Year without a Summer was one of the most devastating European winters ever, worst famine in the 19th century, and caused a mass agricultural disaster.

The areas with the biggest temperature drops were at the center of Napoleon's First French Empire. However, in terms of famine, Britain and Germany were more damaged due to being colder in the first place. Wide starvation caused riots, arson, and looting in many cities throughout Europe.

What would have happened if the 1816 Year without a Summer occurred in a surviving Napoleonic Empire?

Consider two scenarios: a declining France fighting off the last of the Coalition. And alternatively, a stable, ascendant France still dominating Western Europe. (If you'd like, you can also consider an 1816 instead of 1812 invasion of Russia.) How would the effects differ?

TPYqXLW.png
 
Fighting on the defense, the French might actually get an advantage from the probable drop in agricultural productivity, if it makes it markedly harder for enemy armies to requisition supplies in French territory. If the Allied-Prussian, Austrian, Russian armies were all defeated separately in 1815, the difficulty of campaigning in enemy territory and their division over issues like Saxony and Poland might split the coalition.
 

Deleted member 97083

If the British were still fighting a surviving Napoleonic Empire (and possibly the US) in 1816, and didn't have access to food imports from continental Europe, then would the Great Potato Famine in Ireland have occurred earlier due the British confiscating/importing Irish agricultural output to England to meet shortages in England?

Would this lead to an Irish revolt, possibly by a group including former members of United Irishmen? Also, with the US slightly less of an option for Irish immigration (since immigration didn't pick up until the 1840s-1860s) then do they go to the US causing an earlier wave of immigration, or somewhere else? Canada or Australia perhaps?
 
Top