gridded_history_15km | Athenium Docs

Global 15km gridded weather history (ERA5 + NOAA GFS). Use geolocator first for coordinates.

Call gridded_15km_available_variables first to verify available fields before querying.

Data source: ERA5 (historical) for dates older than 7 days; GFS for the last 7 days.
Latency: DAILY has minimal lag; HOURLY lags ~1 week; MONTHLY lags ~2 months; ANNUAL through last complete year.

For CONUS temperature and wind queries, prefer gridded_history_location_2km for higher resolution.
Use this tool for the full variable set, non-CONUS locations, and general atmospheric queries.

Interannual mode (interannual=True): Repeats a calendar window across years for climatological analysis
(e.g., Mar 1-8 for every year 1990-2025). Use for trend, anomaly, or "is this unusual?" questions.
Prefer fields='core' to avoid unnecessary latency and token cost.

https://mcp.barocline.com/mcp

https://mcpkey.barocline.com/weather-risk/mcp

https://mcpoauth.barocline.com/mcp

Read-onlyIdempotent

Parameters

Name	Type	Required	Default
`latitude`	`number`	Yes	-
`longitude`	`number`	Yes	-
`startDate`	`string`	Yes	-
`endDate`	`string`	Yes	-
`fields`	`string`	No	`"standard"`
`interval`	`string`	No	`"DAILY"`
`units`	`string`	No	`"IMPERIAL"`
`time`	`string`	No	`"LWT"`
`context_optimization`	`string`	No	`"auto"`
`processing_mode`	`string`	No	`"full"`
`max_chunks`	`integer`	No	`12`
`content_mode`	`string`	No	`"text"`
`interannual`	`boolean`	No	`false`
`interannual_output`	`string`	No	`"stats"`

Sample input

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "gridded_history_15km",
    "arguments": {
      "latitude": 0,
      "longitude": 0,
      "startDate": "value",
      "endDate": "value",
      "fields": "standard",
      "interval": "DAILY",
      "units": "IMPERIAL",
      "time": "LWT",
      "context_optimization": "auto",
      "processing_mode": "full",
      "max_chunks": 12,
      "content_mode": "text",
      "interannual": false,
      "interannual_output": "stats"
    }
  }
}

{
  "name": "gridded_history_15km",
  "arguments": {
    "latitude": 0,
    "longitude": 0,
    "startDate": "value",
    "endDate": "value",
    "fields": "standard",
    "interval": "DAILY",
    "units": "IMPERIAL",
    "time": "LWT",
    "context_optimization": "auto",
    "processing_mode": "full",
    "max_chunks": 12,
    "content_mode": "text",
    "interannual": false,
    "interannual_output": "stats"
  }
}