Southern Oscillation Index (SOI) for a period of 453 months ranging over the years 1950-1987.

datasets

Data sets and scripts for Time Series Analysis and Its
        Applications: With R Examples by Shumway and Stoffer, 3rd
        edition.

David Stoffer

The format is:
 Time-Series [1:453] from 1950 to 1988: 0.377 0.246 0.311 0.104 -0.016 0.235 0.137 0.191 -0.016 0.29 ...

Data furnished by Dr. Roy Mendelssohn of the Pacific Fisheries Environmental Laboratory, NOAA (personal communication).