Astroclimatology of ESO Sites	ESO WIDE REVIEW M. Sarazin, April 2000, 2/10

Statistics of photometric nights at Paranal (red, 75%) and La Silla (blue, 76%) since UT1 first light, including downtime for humidity. Data is extracted from the telescope observing logs when available, otherwise from the DIMM photometric database (Feb99-Jun99). The dashed lines give the respective long term (83-now) sites characteristics (Paranal: 78%, LaSilla: 61%).