Global Information and Early Warning System on Food and Agriculture (GIEWS) monitors the condition of major foodcrops to assess production prospects. GIEWS utilizes remote sensing data that can provide a valuable insight on water availability and vegetation health during the cropping seasons. It provide maps and graphs at country level, depicting the latest 36-month period of the seasonal, vegetation and precipitation indicators. and presenting data by dekad and month.
Source: http://www.fao.org/