Hi Everyone,
I had some difficulty finding good data sources, so I am posting the ones I have found. I hope this helps. I also found a free Excel Add-in for calculating ARIMA and Autocorrelation in the last site below.
Time Series Data Library
http://www-personal.buseco.monash.edu.au/~hyndman/TSDL/
University of Dayton - Daily Temperature Archive
http://www.engr.udayton.edu/weather/
Excel Add-in
http://www.web-reg.de/arma_addin.html#
Thanks,
Chris Johnson