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Ambient Conditions Database
The ESO ambient conditions database includes measurements of environmental parameters for the La Silla Paranal observatory at three sites in Northern Chile: La Silla, Paranal and Chajnantor (APEX observatory site).
Please select one of the following observatory sites to search the database by date and display environmental parameters:
| La Silla ambient graphical monitor |
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| Paranal ambient graphical monitor | Paranal ambient query form |
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| APEX weather graphical monitor | APEX weather query form |
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Some further links:
- Paranal astroclimatology
- La Silla astroclimatology
- The atmosphere above Llano de Chajnantor (APEX observatory site)





