Arctic Sea Ice Extent for One Calendar Month, Every Year (NSIDC Sea Ice Index)

nsidcnoaadata/arctic-monthly-sea-ice-extent

The monthly mean Arctic sea ice extent and area from the NSIDC Sea Ice Index (Version 4, dataset G02135) for one calendar month across every year on record (1979 to the latest), in million square kilometres. Pass the month as 01 to 12; 09 gives the September minimum series and 03 the March maximum series. The citation NSIDC asks for is included. NSIDC data, reshaped from CSV to JSON and served by Eden Engine; not an official NSIDC product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

National Snow and Ice Data Center (NSIDC)

Data from the National Snow and Ice Data Center (NSIDC), NOAA@NSIDC Sea Ice Index, Version 4 (G02135), public domain per nsidc.org/data/data-policies. Citation: Fetterer, F., Knowles, K., Meier, W. N., Savoie, M., Windnagel, A. K. & Stafford, T. (2025). Sea Ice Index. (G02135, Version 4). Boulder, Colorado USA. National Snow and Ice Data Center. https://doi.org/10.7265/a98x-0f50. Served by Eden Engine; not an official NSIDC product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "nsidcnoaadata/arctic-monthly-sea-ice-extent" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "nsidcnoaadata/arctic-monthly-sea-ice-extent" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "nsidcnoaadata/arctic-monthly-sea-ice-extent", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "nsidcnoaadata/arctic-monthly-sea-ice-extent", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 24, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "month"
  ],
  "properties": {
    "month": {
      "enum": [
        "01",
        "02",
        "03",
        "04",
        "05",
        "06",
        "07",
        "08",
        "09",
        "10",
        "11",
        "12"
      ],
      "type": "string",
      "description": "Calendar month as two digits: 09 is September (the yearly minimum), 03 is March (the yearly maximum)."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "dataset",
    "unit",
    "citation",
    "rows"
  ],
  "properties": {
    "rows": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "area": {
            "type": "number",
            "description": "Monthly mean sea ice area, million square kilometres."
          },
          "year": {
            "type": "integer"
          },
          "month": {
            "type": "integer"
          },
          "extent": {
            "type": "number",
            "description": "Monthly mean sea ice extent, million square kilometres."
          },
          "region": {
            "type": "string",
            "description": "N for the northern hemisphere."
          },
          "sourceDataset": {
            "type": "string",
            "description": "The NSIDC passive-microwave product the value came from, for example NSIDC-0051 or NSIDC-0803."
          }
        },
        "additionalProperties": true
      },
      "description": "One row per year, oldest first."
    },
    "unit": {
      "type": "string",
      "description": "Unit of extent and area."
    },
    "dataset": {
      "type": "string"
    },
    "citation": {
      "type": "string",
      "description": "The citation NSIDC asks users to give."
    },
    "rowCount": {
      "type": "integer",
      "description": "How many rows the source file holds."
    }
  },
  "description": "One row per year for the chosen month.",
  "additionalProperties": true
}