Arizona Radio Observatory (ARO), University of Arizona, ARO/SMT, Weather Statistics, Optical Depths at ARO (in Kitt Peak) and the Sub-Millimeter Telescope (SMT) in Mount Graham 

 Calar Alto Observatory, CAHA, Operational Meteorological Data 

European Southern Observatory, Atacama Pathfinder Experiment, Operational Meteorological and Precipitable Water Vapor Data 

European Southern Observatory, Very Large Telescope, Precipitable Water Vapor Monitoring Site 

European Southern Observatory, Very Large Telescope, Astronomical Site Monitor Database & Meteorological Database

European Southern Observatory, Atacama Large Millimeter Array, Site Testing Database (1998-2005) 

European Southern Observatory, Climate Data, FriOWL 3.1 Computer Interface 

Indian Institute Of Astrophysics, Himalayan Chandra Telescope, Hanle, Operational & Archived (Plots) Meteorological Data 

Instituto de Astrofísica de Canarias, Sky Team, Operational Meteorological Data

Italian Antarctic Research Programme (PNRA), Meteo-Climatological Observatory, AWS Charts (16 stations across the Antarctica)  

Las Campanas Observatory, GMT Project, Site Testing Database

Large Binocular Telescope Observatory, LBTO, Advanced LBT Turbulence and Atmosphere Model (ALTA) website keep at Inaf – Osservatorio Astrofisico di Arcetri

Large Binocular Telescope Observatory, LBTO, Operational Telemetry/Seeing Data

Mauna Kea Weather Center, MKWC, Operations Database: Forecast & Data Archive

National Astronomical Observatory of Japan, Nobeyama Radio Observatory, Atmospheric Transmission at Pampa La Bola by means of FTS measurements (150 GHz to 1.6 THz)

National Radio Astronomy Observatory, Atacama Large Millimeter Array, Site Testing Database (1998-2004)

National Solar Observatory, GONG Project, Solar flux data plots & analysis at GONG Sites

National Solar Observatory, GONG Network Monitor, Current Solar Radiation at GONG Network Sites

Observatoire universitaire d’Astronomie Cadi Ayyad, Oukaimeden, Maroc, Meteorological Data Plots, ASCAM, NW-Africa Cloud Coverage

Observatorio del Roque de los Muchachos, ORM – La Palma, Meteorological Data (Operational & Archive)

Observatorio del Roque de los Muchachos, ORM – La Palma, Seeing (Operational)

Observatorio del Roque de los Muchachos, ORM – La Palma, PWV ( Operational & Archive)

Observatorio del Teide, OT – Tenerife, Meteorological Data (Operational & Archive)

Observatorio del Teide, OT – Tenerife, Seeing (Operational)

Observatorio de la Armada en San Fernando (ROA), Carlsberg Meridian Telescope, Atmospheric Extinction (in V) at CAM, La Palma, Islas Canarias (1984-Present)

South African Astronomical Observatory (SAAO), South African Large Telescope (SALT), MASS-DIMM Seeing Database

South African Astronomical Observatory (SAAO), South African Large Telescope (SALT), Current Weather Conditions

Thirty-Meter Telescope,  TMT Project, Site Testing Database (2004-2008)