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Hong Kong Observatory vs Open-Meteo Archive

Same instrument, two spec sheets — measured, not claimed.

APIHong Kong ObservatoryHEALTHY60Open-Meteo ArchiveDEAD0
Uptime · 30d
Uptime · 90d100%0.0%
Uptime · 30d100%0.0%
P50 · ms1415—
P95 · ms3670—
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseHKO open data (see terms of use)Unverified
Free tierFree, no keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hong Kong Observatory vs Open-Meteo Archive: common questions

Which is more reliable, Hong Kong Observatory or Open-Meteo Archive?

On our scheduled checks, Hong Kong Observatory leads on measured uptime — Hong Kong Observatory at 100% versus Open-Meteo Archive at 0.0% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Hong Kong Observatory and Open-Meteo Archive need an API key?

Neither needs a paid key — Hong Kong Observatory is callable with no signup, and Open-Meteo Archive is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Hong Kong Observatory and Open-Meteo Archive from the browser?

Yes — both Hong Kong Observatory and Open-Meteo Archive send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Hong Kong Observatory and Open-Meteo Archive free for commercial use?

Hong Kong Observatory has unclear commercial terms, and Open-Meteo Archive has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.