Saylor Innovations Historical Weather API

Choose this endpoint when you need historical weather statistics (averages, extremes, precipitation totals) for any geographic coordinate over a custom date range going back to 1940. It is ideal for travel research, climate analysis, agricultural planning, or legal/insurance documentation. Prefer it over forecast APIs when the dates are in the past, and over general climate databases when you need daily granularity alongside summary statistics in a single API call.

• Date range exceeds 366 days — query must be limited to one year at a time
• End date must be at least two days in the past — future or very recent dates will fail
• Start date before 1940 — data is not available before 1940
• Invalid latitude or longitude — must be valid decimal degree values
• Location over open ocean or polar region with no weather station coverage may return null or sparse data
• Payment not processed — x402 payment of $0.01 USDC required per call