> ## Documentation Index > Fetch the complete documentation index at: https://aisa.one/docs/llms.txt > Use this file to discover all available pages before exploring further. # Historical Forecast > Archived past runs of the high-resolution forecast models. Retrieve the actual high-resolution forecasts that were issued in the past (archived model runs, not reanalysis) for a coordinate. `start_date` and `end_date` (`yyyy-mm-dd`) are **required** and select the archived interval. The variable model matches the [forecast endpoint](/docs/api-reference/openmeteo/get_openmeteo-forecast): request fields with `hourly` and/or `daily` lists. The response returns grid-cell metadata and the requested resolution blocks, each with a `time` array, one array per variable, and a matching `*_units` object. Example: `GET /apis/v1/openmeteo/historical-forecast?latitude=52.52&longitude=13.41&start_date=2023-06-01&end_date=2023-06-07&hourly=temperature_2m,precipitation`. **Billing: \$0.00015 per call (150 micros USD), metered per request.** All Open-Meteo endpoints are GET pass-through — authenticate with your AIsa API key as a bearer token (the same key used across every AIsa `/apis/*` endpoint); AIsa handles provider access. ## OpenAPI ````yaml openapi/openmeteo.json GET /openmeteo/historical-forecast openapi: 3.0.3 info: title: Open-Meteo Weather API version: 1.0.0 description: >- Open-Meteo weather data routed through the AIsa gateway: forecast, historical, air quality, marine, ensemble, seasonal, climate, flood, geocoding and elevation. All endpoints are GET pass-through to Open-Meteo (open-meteo.com); AIsa handles provider access. Flat pricing of $0.00015 per call (150 micros USD), metered per request. servers: - url: https://api.aisa.one/apis/v1 security: - BearerAuth: [] paths: /openmeteo/historical-forecast: get: summary: Historical Forecast description: >- Archived past runs of the high-resolution forecast models (the actual forecasts that were issued at the time, not reanalysis). Same variable model as the forecast endpoint; `start_date`/`end_date` select the archived interval. GET pass-through to `https://historical-forecast-api.open-meteo.com/v1/forecast`. Billed $0.00015 per call, metered per request. operationId: get_openmeteo_historical_forecast parameters: - name: latitude in: query required: true description: >- WGS84 latitude of the location. Multiple coordinates can be comma-separated. schema: type: string example: '52.52' - name: longitude in: query required: true description: >- WGS84 longitude of the location (negative for the Americas). Multiple coordinates can be comma-separated. schema: type: string example: '13.41' - name: start_date in: query required: true description: Start of the interval, `yyyy-mm-dd` (ISO 8601). schema: type: string example: '2024-01-01' format: date - name: end_date in: query required: true description: End of the interval, `yyyy-mm-dd` (ISO 8601). schema: type: string example: '2024-01-07' format: date - name: hourly in: query required: false description: >- Comma-separated list of hourly variables to return. Common values: `temperature_2m`, `relative_humidity_2m`, `dew_point_2m`, `apparent_temperature`, `precipitation`, `rain`, `showers`, `snowfall`, `weather_code`, `pressure_msl`, `cloud_cover`, `wind_speed_10m`, `wind_direction_10m`, `wind_gusts_10m`, `shortwave_radiation`, `visibility`. schema: type: string example: temperature_2m,precipitation,wind_speed_10m - name: daily in: query required: false description: >- Comma-separated list of daily aggregation variables to return. Requires `timezone`. Common values: `temperature_2m_max`, `temperature_2m_min`, `temperature_2m_mean`, `precipitation_sum`, `rain_sum`, `snowfall_sum`, `weather_code`, `sunrise`, `sunset`, `sunshine_duration`, `wind_speed_10m_max`, `uv_index_max`. schema: type: string example: temperature_2m_max,temperature_2m_min,precipitation_sum - name: elevation in: query required: false description: Manual elevation (meters). Defaults to a 90m DEM. schema: type: string example: '38' - name: temperature_unit in: query required: false description: Temperature unit. Default `celsius`. schema: type: string enum: - celsius - fahrenheit default: celsius - name: wind_speed_unit in: query required: false description: Wind speed unit. Default `kmh`. schema: type: string enum: - kmh - ms - mph - kn default: kmh - name: precipitation_unit in: query required: false description: Precipitation unit. Default `mm`. schema: type: string enum: - mm - inch default: mm - name: timeformat in: query required: false description: Time output format. Default `iso8601`. schema: type: string enum: - iso8601 - unixtime default: iso8601 - name: models in: query required: false description: >- Comma-separated forecast models to retrieve archived runs for. Default best match. schema: type: string example: best_match - name: timezone in: query required: false description: >- IANA time zone name (e.g. `Europe/Berlin`) or `auto` to resolve from coordinates. Defaults to `GMT`. schema: type: string example: Europe/Berlin - name: cell_selection in: query required: false description: Grid-cell preference for the coordinate. Default `land`. schema: type: string enum: - land - sea - nearest default: land responses: '200': description: Archived forecast for the interval. content: application/json: schema: type: object example: latitude: 52.52 longitude: 13.41 generationtime_ms: 0.8 utc_offset_seconds: 0 timezone: GMT elevation: 38 hourly_units: time: iso8601 temperature_2m: °C precipitation: mm hourly: time: - 2023-06-01T00:00 temperature_2m: - 14.2 precipitation: - 0 components: securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: AISA API Key ````