Seasonal variability

Below is my parking lot last year, after the snow had been melting a while. The snow is stacked in two stories.

Below is the same view of the same parking lot, the same time of year this year, just a day after our final snow.

All of that snow was gone that very week.

Here is the big picture from NASA:

http://www.flickr.com/photos/gsfc/6841323036/in/photostream/