It came a tad early and it was normal temperature, falling above average as the winter went on.
Here's a great (French) source for it.
http://vannevar.blogspot.com/2009/03/minard-napolean-russia-1812-best-chart.html
The trouble is, Napoleon was already beaten by the time the cold came on. The cold made the retreat a disaster, but absense of it wouldn't have given him a victory.
Here's a great (French) source for it.
http://vannevar.blogspot.com/2009/03/minard-napolean-russia-1812-best-chart.html
The trouble is, Napoleon was already beaten by the time the cold came on. The cold made the retreat a disaster, but absense of it wouldn't have given him a victory.