S&P 500 · Realized Volatility — The Market's Breathing Rate
20-day and 60-day annualized volatility. Long-term median is around 15%. Readings above 30% typically mark transitional phases in the cycle.
What this page answers
This static page is built to answer searches for S&P 500 · Realized Volatility. It summarizes the live dataset behind the The Market's Breathing Rate panel and links to the full interactive chart.
20-day and 60-day annualized volatility. Long-term median is around 15%. Readings above 30% typically mark transitional phases in the cycle. The data is refreshed by the History of Market pipeline and published as a stable JSON endpoint for research, citation, and AI-agent use.
Latest Snapshot
- Updated
- 2026-04-30
- Observations
- 24,698
- Sample
- 1927-12-30 – 2026-04-29
- 20D vol
- +11.8%2026-04-29
- 60D vol
- +15.4%2026-04-29
Static Preview
Data & Source
GET /api/sp500/volatility.json — Canonical dataset endpoint.
Yahoo Finance · Macrotrends · Robert Shiller · FRED · S&P Global · Nasdaq · NBER.
FAQ
Where does this data come from?
History of Market combines public market and macro datasets including Yahoo Finance, Macrotrends, Robert Shiller, FRED, S&P Global, Nasdaq, and NBER. The exact endpoint for this panel is linked below.
How often is it updated?
Daily-tier datasets refresh after the U.S. market close, with a broader weekly refresh on Sunday. The timestamp shown on this page comes from the JSON payload.
Can I use the data?
Yes, for research and education with attribution to History of Market. Upstream data sources retain their own terms.