Here is a screen shot showing the options of date filters for the report, including last seven days, last 28 days, last three months, last six months, last 12 months and full duration:
Glenn Gabe of G-Squared Interactive also is able to see it in his beta Google Search Console reports:
On the first day of Christmas, Google gave to me… *12 months of data in the new GSC*!!
OMG, here we go folks. I'm seeing 12 months of data in the Search Analytics beta. I asked and I've been told I can share this screenshot.
Happy Holidays to all SEOs. 🙂 pic.twitter.com/VhL5qsMlRW
— Glenn Gabe (@glenngabe) December 13, 2017
I suspect the “full duration” means Google will be showing even more than 12 months of data in these reports, although that is unconfirmed and unclear at this moment. We will keep you posted on Google’s answer to that question.
If you are part of the beta, you should be able to access this information now.
Google has been hinting it would be giving webmasters longer-term data since 2013, and now, a few years later, we’ve got it, at least in beta.