Recent data for the Sierra Passes: http://www.dot.ca.gov/hq/roadinfo/clsdlst.htm
(Tioga Pass closed 1/25/2012)
Tioga Pass 1933-2011 closure dates:http://www.monobasinresearch.org/data/tiogapass.htm
I'm not an old-timer yet, but it looks like the other time the closure window was this short was around when I was born.
1976: opened April 10th, closed December 29th, and opened again April 8th, 1977.
The small amount of consecutive days closed for the winter/spring of 2011-2012 will be right around record breaking, but the most notable number was the record breaking late closure date of January 25th.
The relatively early opening dates this year are interesting to me, but I still have to convince my wife that heading to the Sierra passes in a couple of weeks beats heading down the coast.
Edit: I just noticed that the monobasinresearch.org link currently lists the closure this winter as beginning January 17, conflicting with the caltrans link, and with details that I vaguely recall.