
Official machine-readable U.S. forecasts, observations and alerts, with documented access and operational guidance.
- Access API
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Choose weather evidence for the location, period and question you are investigating. Compare actual observations and analytical inputs rather than a venue’s weather-market filter.
A forecast and a measured condition serve different research purposes. Read what the source supplies and connect it to the contract’s wording before interpreting a value.

Official machine-readable U.S. forecasts, observations and alerts, with documented access and operational guidance.

An external weather API for comparing models and reconstructing forecasts available at a historical decision.

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