Introduction & principle
Pulls free Open-Meteo cloud cover, relative humidity, and visibility, then derives a 1–10 transparency index based on standard astronomical seeing conventions.
All toolsAtmospheric Observation
Atmospheric Transparency Query
Estimate local atmospheric transparency for astronomical and meteorological observation.
Live tool
Transparency index
0/10
Tool advantage
Niche metric mainstream weather apps do not expose at all.
Detailed usage guide
- 1Allow geolocation or enter latitude and longitude.
- 2Read the transparency index and the underlying numbers.
- 3Refresh to fetch updated atmospheric data.
Common problems & FAQ
Why is transparency low even on a clear day?
High humidity, dust, or upper-level cirrus reduces transparency without producing obvious clouds.
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