Current PSD (Web/Data Status). PSD has undergone major URL restructuring so that all URLs start with http://www.esrl.noaa.gov/psd/ (More Info).
Boulder Daily Weather data from the NOAA/NWS Cooperative Site
From 1897 to present (text)1940-1949
1950-1959
1960-1969
1970-1979
1980-1989
1990-1999
present
Pages are for curiosity only; there are no guarantees that the data is correct.