Temperature and tornadoes

Because of the lack of  winter and early spring tornadoes, I checked the periods with no tornadoes, for the US.  When it's cold there are no tornadoes.

This is due to the lack of warm moist air meeting the cold fronts.  Strong very cold fronts prevent tornadoes from happening.

They also result in a lot more snow.

Colder weather means less snow, warmer weather means more snow

Hard to believe, but it's true!

OK that's a bad joke.  Of course it's not true.

Does it have to be cold to snow?

This seems like a stupid question, but the importance of the principle is simple.

Yes, it has to be cold to snow.  It does not snow when it's warm.

The Pocket Idiot's Guide to More Not So Useless Facts

Extensive post on this coming up.

Milder winter temperatures will decrease heavy snowstorms IPCC 2001

This is true of course.  And colder winters result in more snow.