Table 2
Overview of in situ data.
| Site | Data | Observatory or telescope | Time period | Frequency |
|---|---|---|---|---|
| Mauna Kea | Meteo (a) | CFHT | 2000–2019 | 1–10 min (24 h) |
| Seeing (b) | MKWC | 2010–2019 | 2 min (night-time hours) | |
| PWV (c) | JCMT | 2009–2019 | 2 s (24 h) | |
| Weather loss | Gemini South | 2014–2017 | 1 day (night-time) | |
| Paranal | Meteo, Seeing | VLT | 2000–2019 | 1 min (24 h) |
| PWV | VLT | 2016–2019 | 2 min (24 h) | |
| photometric nights(d) | VLT | 1984–2017 | 1 month | |
| La Silla | Meteo | La Silla observatory | 2000–09/2008, 2011–2019 | 10 min (24 h) |
| Seeing | La Silla observatory | 2000–2019 | 1 min (24 h) | |
| PWV (e) | La Silla observatory | 2000–2007 | 3 h (24 h) | |
| photometric nights(d) | VLT | 1984–2017 | 1 month | |
| Cerro Tololo | Meteo | CTIO | 2002–2018 | 5 min (24 hours) |
| Seeing | CTIO | 2004–2019 | 1 min (night-time) | |
| Cerro Pachon | Weather loss | Gemini North | 2013–2017 | 1 day (night-time) |
| La Palma | Meteo (f) | NOT | 2004–2019 | 5min (24 h) |
| Seeing (g) | IAC (ING) | 2004–2019 | 3 min (night-time) | |
| Weather loss(h) | TNG | 2012–2016 | 1 day (night-time) | |
| Siding Spring | Meteo | AAT | 2004–2019 | 10 min (24 h) |
| Seeing (i) | AAT | 1993–2019 | by semester (night-time) | |
| Weather loss | AAT | 1993–2018 | 1 day (night-time) | |
| Sutherland | Meteo | SALT | 2013–2019 | 1 min (24 h) |
| SPM | Meteo (j) | OAN | 2006–2019 | 15 min (24 h) |
| Seeing (k) | TMT site testing campaign | 10/2004–08/2008 | 1 min (night-time) | |
| Pressure (k) | TMT site testing campaign | 10/2004–08/2008 | 2 min (24 h) |
Notes. It is indicated from which observatory the data come from, the time period and the frequency of the measurements. If no web page is indicated in the following, we retrieved the in situ data via private communication with the indicated observatory. All web pages were accessed in the time period September 2019 to September 2020. (a) http://mkwc.ifa.hawaii.edu/archive/wx/cfht/; (b)http://mkwc.ifa.hawaii.edu/current/seeing/mass/; (c) constructed URL with ‘YYYY’ as placeholder for the year, ‘MM’ for the month and ‘DD’ for the day: https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/data/pub/JCMT/YYYYMMDD.wvm; Col. 10; (d) https://www.eso.org/gen-fac/pubs/astclim/paranal/clouds/clouds-LPO.txt; (e) https://www.eso.org/gen-fac/pubs/astclim/lasilla/h2o/laseranal.dat; (f) http://www.not.iac.es/weather/archive/met/; (g) http://catserver.ing.iac.es/robodimm/; (h) (Molinari & Hernandez 2012, 2014); (i) (Brookfield et al. 2020); (j) http://tango.astrosen.unam.mx/weather15/,(Plauchu-Frayn et al. 2020); (k) https://sitedata.tmt.org/Available_data/data_fields.html
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