We do not store our forecasts.
This is simply because of the incredible volume of forecasts we generate - 600 million each hour!
If you are interested in forecasting accuracy, there are a few things you can do:
Use the API Toolkit to create a site at your location of interest and then review the 'accuracy' chart which has the 1-hour ahead forecasts for the past 7 days archived
Use the API Toolkit to create a site at your location of interest and begin downloading the forecast data regularly for your own comparison
If you need these data for a project and have budget available, we can offer one-off forecast extracts for you at cost. Get in touch with us if that sounds like you!