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AviationWeather vs National Grid ESO

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

APIAviationWeatherNEW—National Grid ESONEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licensePublic domain (U.S. Government / NOAA)NESO Open Data Licence (OGL-based); varies per dataset
Free tierFree, no keyFree — limits not published
Rate limitUnpublished (NWS requests reasonable use)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AviationWeather vs National Grid ESO: common questions

Which is more reliable, AviationWeather or National Grid ESO?

On our scheduled checks, National Grid ESO leads on measured uptime — AviationWeather at —% versus National Grid ESO 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 AviationWeather and National Grid ESO need an API key?

Neither needs a paid key — AviationWeather is callable with no signup, and National Grid ESO is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call AviationWeather and National Grid ESO from the browser?

Only National Grid ESO is browser-friendly — it returns CORS headers over HTTPS. AviationWeather needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are AviationWeather and National Grid ESO free for commercial use?

AviationWeather allows commercial use on its free tier, and National Grid ESO 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.