I do not know about Europe as a whole, but 1911 was pretty bad in the UK: https://en.wikipedia.org/wiki/1911_United_Kingdom_heatwave

Popular Mechanics, March 1912 — an article titled “Remarkable Weather of 1911: The Effect of the Combustion of Coal on the Climate.”

Have you read this before? Great read.

	▲	graemep 5 hours ago \| parent [-]
		I have not read that article, but I was aware Arrhenius calculated the effects of CO2 on global temperatures earlier. AFAIK his models has held up very well, possibly because of its simplicity compared to current models (I tend to distrust complex models).