Get past weather including air density
We frequently get asked about weather from previous dates. In addition to the current and forecast weather, we have a historical weather option for most tracks. It display hourly weather including air density and density altitude.
You can view historical weather by clicking on the [H] link next to the track name in the list of tracks or by clicking on the historical link on each track's current weather page.
We wrote an article with more information you can check out.