General information

AccuWeather's Historical API delivers archived daily weather observations going as far back as January 1, 1990, with new days added continually. Useful for forensic analysis, climate trend studies, insurance verification, and any application that needs reliable historical context.

Coverage spans 85,000+ global locations with 15+ derived parameters, including AccuWeather's patented RealFeel® and RealFeel® Shade temperatures.

Data is available in more than 200 languages and dialects, in both JSON and CSV formats.

→ See the Historical Guide and Parameters for endpoint details and request patterns.

Day boundaries

By default, daily records cover the meteorological day (7:00 AM to 7:00 AM local time) — aligned with standard observation practice.

Pass calendar=true to retrieve data for the calendar day instead (midnight to midnight local time). Use this when aligning historical data with business or consumer day-based reporting.

Time zones

All data is in local standard time. Queries must be placed based on local time for the requested LocationKey.

Requirements

Historical API searches require a LocationKey. Use the Locations API to look one up.