you know it's winter when...

...you smell the wonderful smell of 'fireplace' walking to work on a cold morning.
...it's raining in San Diego instead of snowing.
...you think your head is going to explode from the sheer volume of typing you have to do.
...snowmobiling becomes your preferred method of transportation.
...your stress level starts to go down.

I'm sure there are more to add...those are the first that crossed my mind today!