Where can I see historic forecasts?
On the website or app, there is a calendar icon to the top right of the forecast. Click it to open a calendar in which you can select your window of interest dating back to 2010.
Click the Forecast tab and then the calendar icon in the top right of the screen.
Scroll down to the 16-Day Forecast and hit the calendar icon in the top right of the screen.
Select the 16-day forecast window of interest and then hit View Forecast to get your historic forecast in the exact same format you're familiar with.