> ## 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. # Ensemble Models > Probabilistic ensemble weather forecasts with per-member arrays. Fetch probabilistic ensemble forecasts for spread and probability analysis. `models` is **optional** — omit it to get the default best-match global ensemble (a 30-member set), or pass a comma-separated list such as `icon_seamless`, `gfs_seamless`, `ecmwf_ifs025` or `gem_global`; each model exposes its own number of members. Request variables with `hourly` and/or `daily` lists. Every requested variable is returned once per ensemble member, suffixed with the member index (e.g. `temperature_2m_member01`, `temperature_2m_member02`, ...), alongside grid-cell metadata, a shared `time` array and a `*_units` object. Example: `GET /apis/v1/openmeteo/ensemble?latitude=52.52&longitude=13.41&hourly=temperature_2m,wind_speed_10m&models=icon_seamless&forecast_days=7`. **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/ensemble 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/ensemble: get: summary: Ensemble Models description: >- Probabilistic ensemble weather forecasts. Each requested variable is returned once per ensemble member (e.g. `temperature_2m_member01`, `temperature_2m_member02`, ...), enabling spread and probability analysis. `models` is optional — omit it to get the default best-match global ensemble (a 30-member set). GET pass-through to `https://ensemble-api.open-meteo.com/v1/ensemble`. Billed $0.00015 per call, metered per request. operationId: get_openmeteo_ensemble 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: models in: query required: false description: >- Optional; when omitted, defaults to the best-match global ensemble (a 30-member set). Comma-separated ensemble models, e.g. `icon_seamless`, `gfs_seamless`, `ecmwf_ifs025`, `gem_global`. Each model exposes its own member count. schema: type: string example: icon_seamless - 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`. Also `cape`. schema: type: string example: temperature_2m,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,precipitation_sum - name: forecast_days in: query required: false description: Number of forecast days to return (0-35). Default 7. schema: type: integer default: 7 example: 7 - name: past_days in: query required: false description: Number of past days to include (0-92). Default 0. schema: type: integer default: 0 - name: start_date in: query required: false 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: false description: End of the interval, `yyyy-mm-dd` (ISO 8601). schema: type: string example: '2024-01-07' format: date - 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: 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: Ensemble forecast with per-member arrays. content: application/json: schema: type: object example: latitude: 52.5 longitude: 13.4 generationtime_ms: 2.1 utc_offset_seconds: 0 timezone: GMT elevation: 38 hourly_units: time: iso8601 temperature_2m: °C hourly: time: - 2024-01-01T00:00 temperature_2m_member01: - 2.1 temperature_2m_member02: - 2.4 temperature_2m_member03: - 1.8 components: securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: AISA API Key ````