Where to find historical weather averages?

I have always found it hard to find historical weather on the web. Most
sites are geared to forecasting. What I'm looking for is average highs,
average lows, and precipitation for different locations.

An example of what I'd like is on the right side of this page:
http://www.tripadvisor.com/Tourism-g...Vacations.html

But it only covers 6 months. I want 12.

Then I go to another city and this chart does not appear:
http://www.tripadvisor.com/Hotels-g4...na-Hotels.html

What is really needed is a site when you enter a town or zip code and such
a chart is displayed. And even better if there was a way to compare a bunch
of cities.

Don. www.donwiss.com (e-mail link at home page bottom).
Don. www.donwiss.com (e-mail link at home page bottom).