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Glax Weather API vs Groundhog Day API

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

APIGlax Weather APIHEALTHY87Groundhog Day APIHEALTHY98
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1004262
P95 · ms2534596
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Glax Weather API vs Groundhog Day API: common questions

Which is more reliable, Glax Weather API or Groundhog Day API?

Both are neck-and-neck — Glax Weather API and Groundhog Day API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Glax Weather API or Groundhog Day API?

Groundhog Day API has the lower median latency in our checks — Glax Weather API responds in 1004 ms versus Groundhog Day API at 262 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Glax Weather API and Groundhog Day API need an API key?

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

Can I call Glax Weather API and Groundhog Day API from the browser?

Only Groundhog Day API is browser-friendly — it returns CORS headers over HTTPS. Glax Weather API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Glax Weather API and Groundhog Day API free for commercial use?

Glax Weather API has unclear commercial terms, and Groundhog Day API 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.