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Astroclimatology of La Silla

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General Observing Conditions and Data for La Silla

 * Seeing.
 * Atmospheric Extinction Coefficients at La Silla (from Geneva Observatory)
 * Differential atmospheric refraction
 * Sky Brightness (V and NIR)
 * Precipitable Water Vapour and local Relative Humidity
 * Wind, Air Temperature, Dew Point and Relative Humidity Statistics, La Silla Weather limits (RH, wind) 1994 to 2017 (pdf), statistics 2002 to 2006 (pdf) and seasonal, 1999 to 2007 (pdf). Minimum recorded outside temperature at La Silla in the period 1994-2017: -6.6C (July 17, 2010, 11h46UT)
 * Cloudiness Monthly Average since 1983, differential Paranal-La Silla , Seasonal 1987-1995, 1987-2014, yearly (1984-2013).
 * Wind Velocity and gust at ground level (1998-2007) and at the tropopause level

Yesterday, Today and Tomorrow

 * Astroclimate or old ambient server
 * Satellite Images and Weather Forecasts

Further Info

 * The La Silla Astronomical Site Monitor (ASM)
 * Environmental Conditions at ESO Observatories (Trimestrial Reports, discontinued in 1999)
 * An analysis of the relationship of El-Nino to the cloud cover at ESO observatories, The ESO Messenger 90, December 97 ( ps file )

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