Air temperature

One subscription REST Weather API for historical, real-time, forecast, and climate data. Historical requests use the same product, endpoint grammar, authentication, scalar parameter catalogue, response version, and delivery formats as other Weather API requests; do not split a Historical endpoint into another Source. Requests support single points, point lists, lines, and grids worldwide. Public documentation proves historical dated requests but does not pin one universal archive start because availability depends on subscribed parameters and data sources.

Global hourly and synoptic surface-observation product integrating more than 100 source formats into one ISD schema. It publishes station and observation identifiers, UTC timestamps, coordinates, temperature, wind, gust, precipitation, present-weather, and embedded quality codes through NCEI Access Data Service and bulk Global Hourly files.

A separately named Version 2 station summary product publishing hourly, daily, and monthly observations in station-year CSV files and monthly summary forms. It is derived from NCEI station datasets but has its own documented 125-column CSV schema, metric bulk files, U.S.-focused station coverage with limited U.S. Air Force locations abroad, and standing per-station/year plus all-station archive access.

Historical reanalysis API at archive-api.open-meteo.com/v1/archive for arbitrary WGS84 points, multiple coordinates, and ISO dates. It publishes gap-filled, model-assisted—not station-only—hourly weather. Available models include global ERA5 from 1940, ERA5-Land from 1950, and ECMWF IFS from 2017. Paid Professional-or-higher access uses the same syntax on reserved customer endpoints and grants commercial use.

Commercial POST /v4/historical API for buyer-selected point, line, or polygon locations, fields, one-hour or one-day timestep, and ISO-8601 start/end times. The archive is a reanalysis product blending forecasts and observations; core worldwide-land fields generally run from 2000-01-01 through seven days before present, with 7–90-day processing latency depending on field. Each call is limited to a 31-day range.

Commercial version-2.0.1 API returning daily or hourly NOAA-reanalysis history for arbitrary latitude/longitude points, postal codes, DMAs, and OnPoint identifiers. Coverage is every landmass worldwide and up to 200 miles offshore; the public specification does not pin the earliest retained date.