The State of the Climate is a collection of periodic summaries recapping climate-related occurrences on both a global and national scale. The State of the Climate Monthly Overview - Global El Niño/Southern Oscillation report describes atmospheric and oceanic conditions related to ENSO, a periodic fluctuation in sea surface temperature (El Niño) and the air pressure of the overlying atmosphere (Southern Oscillation) across the equatorial Pacific Ocean. Each report provides a status statement and descriptions of the following indicators: 1) Sea surface temperatures (SSTs) and mixed-layer conditions; 2) Equatorial zonal winds (U-component winds) and sea-level topography; 3) Outgoing longwave radiation (OLR); and 4) Southern oscillation index (SOI). Reports were written monthly from January 2004 through October 2009 with annually summaries for 2003-2008. As of the October 2009 report, NCDC no longer wrote a separate assessment of the current state of El Niño/Southern Oscillation as part of its monthly climate report. The information is incorporated in the El Niño Diagnostic Discussion produced each month by the NOAA Climate Prediction Center.