Astroclimatology of ESO Sites
ESO WIDE REVIEW
M. Sarazin, April 2000, 1/10
|CLOUDINESS - LONG TERM|
Statistics of photometric nights at Paranal (line) and La Silla (dashes) since the beginning of the VLT
site survey. Data is collected from visual observations at Paranal and extracted from the telescope
observing logs at La Silla. A photometric night must have at least 6 consecutive hours with a cloudless
sky down to 18 degrees above horizon.