I have a weather station in CT thats about a month away from collecting 5 years worth of continuous data. I created a spreadsheet that tracks the daily averages and extremes.
With only 4 years worth of data its fun because I break a record every few days. But the averages are all over the place, just not enough data points. When I start to run a moving average that includes +/- 10 days of data the graphs finally start to smooth out.
I also update this
page every month. I got the idea from MWO's site.
That's pretty much what I do with the weather when it gets boring.
Edit: Where do you get the national extreme data? Is there a convenient source?