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Hong Kong Observatory vs US Weather

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

APIHong Kong ObservatoryNEW—US WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseHKO open data (see terms of use)U.S. Government work / public domain
Free tierFree, no keyFree (US Government public data)
Rate limitUnpublishedUnpublished (asks for a User-Agent identifying your app)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Hong Kong Observatory vs US Weather: common questions

Which is more reliable, Hong Kong Observatory or US Weather?

On our scheduled checks, US Weather leads on measured uptime — Hong Kong Observatory at —% versus US Weather at —% 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 US Weather need an API key?

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

Can I call Hong Kong Observatory and US Weather from the browser?

Yes — both Hong Kong Observatory and US Weather 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 US Weather free for commercial use?

Hong Kong Observatory has unclear commercial terms, and US Weather allows commercial use on its free tier. 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.