openapi: 3.1.0
info:
  title: Tomorrow.io Historical Weather API
  version: '4.0'
  description: |
    Retrieve historical weather observations and climate normals for any point or
    polygon on Earth. Covers recent history (hourly), long-term archives (going
    back decades), and monthly climate normals, all with the same field catalog as
    the realtime and forecast APIs.
  contact:
    name: Tomorrow.io Support
    url: https://support.tomorrow.io
servers:
  - url: https://api.tomorrow.io/v4
    description: Tomorrow.io Production
security:
  - apikeyAuth: []
tags:
  - name: Historical
    description: Retrieve historical weather data and climate normals.
paths:
  /historical:
    post:
      tags:
        - Historical
      summary: Retrieve Historical Timeline
      operationId: postHistorical
      description: |
        Retrieve a historical weather timeline for a point, polygon, or polyline
        across a given start and end time window. Supports the full field catalog
        and minute, hour, and day timesteps depending on plan tier.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/HistoricalRequest'
      parameters:
        - name: apikey
          in: query
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Historical timeline payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HistoricalResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
  /historical/climate/normals:
    get:
      tags:
        - Historical
      summary: Get Climate Normals
      operationId: getClimateNormals
      description: |
        Retrieve monthly climate normals (long-term averages and percentiles) for a
        given point. Useful for benchmarking current conditions against typical
        conditions for the location and season.
      parameters:
        - name: location
          in: query
          required: true
          schema:
            type: string
        - name: fields
          in: query
          schema:
            type: string
        - name: apikey
          in: query
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Climate normals payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ClimateNormalsResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/RateLimited'
components:
  securitySchemes:
    apikeyAuth:
      type: apiKey
      in: query
      name: apikey
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    RateLimited:
      description: Rate limit exceeded for the plan tier.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  schemas:
    HistoricalRequest:
      type: object
      required:
        - location
        - fields
        - timesteps
        - startTime
        - endTime
      properties:
        location:
          oneOf:
            - type: string
            - type: object
              description: GeoJSON Point/Polygon/LineString
        fields:
          type: array
          items:
            type: string
        timesteps:
          type: array
          items:
            type: string
            enum: [1m, 5m, 15m, 1h, 1d]
        startTime:
          type: string
          format: date-time
        endTime:
          type: string
          format: date-time
        units:
          type: string
          enum: [metric, imperial]
        timezone:
          type: string
    HistoricalResponse:
      type: object
      properties:
        data:
          type: object
          properties:
            timelines:
              type: array
              items:
                type: object
                properties:
                  timestep:
                    type: string
                  startTime:
                    type: string
                  endTime:
                    type: string
                  intervals:
                    type: array
                    items:
                      type: object
                      properties:
                        startTime:
                          type: string
                          format: date-time
                        values:
                          type: object
                          additionalProperties: true
    ClimateNormalsResponse:
      type: object
      properties:
        location:
          type: object
          properties:
            lat:
              type: number
            lon:
              type: number
        data:
          type: object
          properties:
            months:
              type: array
              items:
                type: object
                properties:
                  month:
                    type: integer
                  values:
                    type: object
                    additionalProperties:
                      type: number
    ErrorResponse:
      type: object
      properties:
        code:
          type: integer
        type:
          type: string
        message:
          type: string