Well, I’m going through old photos that have been scanned or otherwise digitized, so there is nothing to tell you when (I can usually guess where). So sometimes it is nice to know when it snowed in Seattle say 10 years ago. How do you do that?
Well NOAA has a precipitation record they keep at the climate data online, but the easiest way was a google search that found a youtube videa of a very snowy seattle on 6 Jan 2004 (Youtube)
To look at the real data, NOAA has a GIS system which shows snowfall for any day or date range at (http://gis.ncdc.noaa.gov/maps/snowfall.map).
Which is pretty cool but only since July 2006 🙁