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WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification

MCP server · hosted · v2.1.0 · com.weatherxm.fact/mcp
Online · tested 1h agoNEW · 2h agoSeen in the registry 1h ago

Scores 45 NWP & AI weather models (ECMWF, GFS, ICON, meteoblue, MOSAIC) against 8,927 stations.

Website ↗How to connect ↓

What it does

WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.

No capability identified yet from its description.

Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.

At a glance

Hosted (remote)YES
Local installNO
Version2.1.0
PriceNot in the registry
First seen05 Nov 2026
Last checked1h ago

How to connect

As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 1h ago (live check)

Hosted endpoint

  • https://fact.weatherxm.com/mcp streamable-http

In Claude Code: claude mcp add --transport http weatherxm-fact-forecast-accuracy-ground-truth-verification https://fact.weatherxm.com/mcp

MCP settings (Claude Desktop, Cursor and other MCP clients)

{
  "mcpServers": {
    "weatherxm-fact-forecast-accuracy-ground-truth-verification": {
      "url": "https://fact.weatherxm.com/mcp"
    }
  }
}

Live check

Electra Index connected to the hosted endpoint 1h ago

ONLINE WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification answered an MCP connection on 05 Nov 2026 and introduced itself as weatherxm-fact-mcp 2.1.0 (MCP protocol 2025-06-18).

4 tools offered to AI assistants

  • get_best_forecast_model · Find which weather forecast model had the lowest verified historical error (MAE) for a latitude/longitude coordinate (or station_or_report_id), weather variable (temperature, wind_speed, precipitation, humidity), and forecast horizon (Days
  • check_ground_truth_coverage · Check historical WeatherXM FACT ground-station publication coverage for any coordinate (H3 Res-7 cell, ~5.2 km²) or station_or_report_id, plus nearest evaluated reference cell distance and interactive map citation link. Useful when assessin
  • get_fact_leaderboard · Read the global weather forecast accuracy leaderboard (MAE, RMSE, and categorical rain skill HSS, POD, FAR, CSI across lead days 0..7) or country-level published H3 cell-win summaries across all 45 forecast models and 8,927 stations. All 45
  • get_model_head_to_head · Compare up to 10 weather forecast models head-to-head across lead days 0 to 7 on global historical error curves, with explicit cohort and station-commissioned (mLM) caveats. All 45 FACT models: WeatherXM MOSAIC (MOSAIC), meteoblue (METEOBLU

What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method

Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.

Facts & evidence

Each fact shows where it was seen and when.
FactValueEvidenceSourceLast confirmed
Hosted endpointhttps://fact.weatherxm.com/mcpDECLAREDSRC-001 Official MCP Registry1h ago
Local install (package)noDECLAREDSRC-001 Official MCP Registry1h ago
Remote access (hosted)yesDECLAREDSRC-001 Official MCP Registry1h ago
Websitehttps://fact.weatherxm.comDECLAREDSRC-001 Official MCP Registry1h ago
Registry statusactiveDECLAREDSRC-001 Official MCP Registry1h ago
Version2.1.0DECLAREDSRC-001 Official MCP Registry1h ago
MCP serveryesDECLAREDSRC-001 Official MCP Registry1h ago

Change history

  • NEW05 Nov 2026
    first seen in the index

Is this page accurate?

Flag it and our robot re-checks the official source. Reports never change a score.

Do you run WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification? Know when it stops answering

For publishers · optional

Its hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.

Monitor WeatherXM FACT — Forecast Accuracy & Ground-Truth VerificationLaunch offer $39.99 once, for life instead of $9.99/month · All plans

Monitoring never changes a score or a rank.

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Questions about WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification

How do I connect WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification?

Use the hosted endpoint https://fact.weatherxm.com/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.

What tools does WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification offer?

When Electra Index connected on 05 Nov 2026, it listed 4 tools: get_best_forecast_model, check_ground_truth_coverage, get_fact_leaderboard, get_model_head_to_head. The full list is in "Live check" above.

Is WeatherXM FACT — Forecast Accuracy & Ground-Truth Verification online?

Yes. Its hosted endpoint answered an MCP connection from Electra Index 1h ago.