GSC historical data has a hard ceiling: Google only ever holds the most recent 16 months, so "historical" in Search Console means less than a year and a half. For a site that has ranked since 2019, that's a sliver of its actual history.
If you need data older than the window, the question splits in two. Did anyone save it at the time? And what do you set up today so the question never comes up again?
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Recovering history from before the window
The bad news first: if nobody exported it, it's gone. No API parameter reaches past 16 months, and Google doesn't restore deleted performance data. The places old history might still exist:
- CSV exports and client reports sitting in Drive folders or email attachments.
- A BigQuery bulk export somebody enabled years ago.
- SEO platforms that were connected to the property early. Ahrefs, for one, accumulates GSC data from its connect date.
It's worth an hour of digging. Even a quarterly CSV from 2022 gives you reference points that nothing else can.
Building history that doesn't expire
From today forward, the window can be made irrelevant. Month17 connects over OAuth, immediately backfills the 16 months Google still has, then adds every new day as it arrives. A year in, you hold 28 months of history. Three years in, more than four years' worth. The archive has no retention limit, so the number keeps growing for as long as the subscription runs.
The history is served over MCP, so it's not a cold-storage dump. Ask Claude or Cursor to compare this November against the last three Novembers and it queries the archive directly. The MCP server page covers how that works.
What multi-year data unlocks
Sixteen months answers "how did last month go". Years answer the questions that decide strategy:
- Year-over-year comparisons, including full calendar years against each other.
- Seasonality with enough cycles to tell a pattern from a coincidence.
- Content decay, which plays out over two or three years and hides completely inside a short window.
- Algorithm update forensics with a real before-and-after, however long ago the update shipped.
Each of those gets cheaper the earlier the archive starts, because the archive can only begin from what Google still has. Starting late is the one mistake this product can't fix.