In July of 2015, I posted an animated yield curve chart:http://pistulka.com/Other/?p=1691.
I have hopefully improved the chart and brought the yields curves up-to-date. You can also add daily curves if you like. The Excel file contains VBA, so some firms might not allow downloads.
The yield curves are on a monthly basis from 1962-1989 and daily from 1990 on.