Basically just an estimate of precipitation based on both surface and satellite measurements. The data set only includes about 15 years worth of satellite-derived data, so it?s reliability over the ocean is still in question. Mean precipitation estimates vary using different techniques, so there is no definitive "correct" technique.
 
 

• Mean yearly precipitation per day: 1979-1996

• Mean Winter precipitation per day: Jan-Mar, 1979-1996

• Mean Spring precipitation per day: Apr-Jun, 1979-1996

• Mean Summer precipitation per day: Jul-Sep, 1979-1996

• Mean Fall precipitation per day: Oct-Dec, 1979-1996

• Animation of 3-year intervals: 1979-1996

• Winter Animation, 3-year intervals: 1979-1996

• Summer Animation, 3-year intervals: 1979-1996

• Animation of 3-year intervals anomalies: 1979-1996

• Month-by-month animation of precipitation: 1979-1996