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Groundhog Day API vs RainViewer

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

APIGroundhog Day APINEW—RainViewerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (attribution requested)
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Groundhog Day API vs RainViewer: common questions

Which is more reliable, Groundhog Day API or RainViewer?

On our scheduled checks, RainViewer leads on measured uptime — Groundhog Day API at —% versus RainViewer 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 Groundhog Day API and RainViewer need an API key?

Neither needs a paid key — Groundhog Day API is callable with no signup, and RainViewer is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Groundhog Day API and RainViewer from the browser?

Yes — both Groundhog Day API and RainViewer 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 Groundhog Day API and RainViewer free for commercial use?

Groundhog Day API has unclear commercial terms, and RainViewer 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.