The following programs are put in the order that they run 

1. get_data_yyyy.pro

IDL code to read in daily raw PF5.2 SST and out binary daily SST. 
Land and low quality values are flagged.

2. sst_timeseries_yyyy.f90

Divide the globe into 128 zones with equal number of grids, and create
the time series for each year (365 days or 366 days) for each pixel in  
each of the 128 zones

3. sst_timeseries_combine.f90

Create the time series for all 26 years from 1985 to 2010 by joining the 
yearly time series together.

4. get_monthly_data.pro

Get the daily data for each month, each year for each pixel in each of 128
zones

5. monthly_mean_timeseries.pro

Calculate the monthly mean time series for each pixel in each of 128 zones