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Most of my advice comes from personal experiences or experiences of friends. The worst delays are infact during weather systems or special events happening where you lay over. One of my friends, who was attending a convention with me, was stuck in Pittsburgh for 3 days due to the sheer amount of outgoing traffic to other places, and inavailablity of seats as well as a huge storm system where he was going (Denver). Another friend of mine was flying for LaGuardia to Atlanta, and her flight was cancelled due to snow in NY, and tornados in Georgia. Around this time of year, I dread any air travel that would touch around the upper states (O'Hare, LaGuardia, etc...) due to the frequency of snow/ice and the holiday season.

There was an article in Forbes explaining the WORST airports, so I can't answer your question of averages, but I can at least warn you of what to avoid when you decide to have your holiday. Here's the URL: http://www.forbes.com/2008/06/02/aviation-travel-delays-biz-logistics-cx_rr_0603travel.html

Have a safe trip, and have a happy holiday!