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

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). Wind Velocity and gust at ground level (1998-2007) and at the tropopause level. 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-now, yearly (1984-now).

Yesterday, Today and Tomorrow

Astroclimate

Satellite Images and Weather Forecasts

Further Info

The La Silla Astronomical Site Monitor (ASM)

An analysis of the relationship of El-Nino to the cloud cover at ESO observatories, The ESO Messenger 90, December 97 ( pdf file )

Send comments to <Marc.Sarazin@eso.org> Last update: Nov 13, 1999