The Remote Sensing Systems (RSS) Monthly 1-degree Microwave Total Precipitable Water (TPW) netCDF dataset V7R01 provides global total columnar water vapor values, or TPW, over ocean areas. This dataset contains monthly, 1-degree TPW means, a 12-month climatology made using 1988 to 2007 data, monthly anomaly maps, a trend map with associated global and tropical TPW time series and trends, and a time-latitude plot. The 1 degree TPW dataset is a merged ocean product constructed using version 7 (V7) passive microwave geophysical ocean products made publicly available by RSS (www.remss.com). TPW values for this dataset were acquired from the following satellite microwave radiometers: SSM/I F08 through F15, SSMIS F16 and F17, AMSR-E, AMSR-2, and WindSat. The radiometers used to construct this dataset were were inter-calibrated at the brightness temperature level, while the V7 ocean products were produced using a consistent processing methodology across sensors.