What was the worst French winter?

The worst French winter is often considered to be the winter of 1709, known as the "Great Winter." It was marked by extreme cold, with temperatures plummeting to as low as -20°C (-4°F) in many regions. The severe weather caused widespread crop failures, leading to famine and significant mortality across France, with estimates of deaths reaching hundreds of thousands. This harsh winter had lasting impacts on the population and economy of the country.