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Monthly mean sunspot number (since 1749): 1 series, monthly data from 1749 to 2026 (3,333 data points, unit: SSN). Source: NOAA SWPC (U.S. Government Public Domain (NOAA Space Weather Prediction Center)). Free JSON or CSV over a REST API and MCP, no API key, updated automatically.
GET https://api.agentdatahub.de/api/v1/series/noaa.sunspot-number?_from=2000&resample=A&format=csv
JSON: drop format=csv · Range: _from/_to (year, YYYY-MM or date) · Resample: resample=D|W|M|Q|A with agg=mean|last|min|max|sum · MCP: tool get_series with {"id":"noaa.sunspot-number"}
| Series id | Title | From | To | Points |
|---|---|---|---|---|
noaa.sunspot-number | Monthly mean sunspot number (since 1749) | 1749-01-01 | 2026-09-01 | 3333 |
| Source | NOAA SWPC |
| License | U.S. Government Public Domain (NOAA Space Weather Prediction Center) |
| Terms | https://www.swpc.noaa.gov/disclaimers |
| Last update | 2026-10-28 09:47:01 UTC |