I installed Hubigraphs about 2.5 years ago, along with the OpenWeather Hubigraph driver, and both are doing what I need.
However, OpenWeather sent an email stating they are shutting down their 2.5 API and I have to upgrade to 3.0. The OW Hubigraph driver is by someone who is no longer part of this community and thus is no longer maintained.
Is there an easy way to update this or will the outdoor weather portion of my graphs just stop working?
This. The webcore graphs is an update to Hubigraphs, and is a part of the HE system now.. You can import any LTS data you have into it. You don't have to use any pistons and the graph potion is almost identical to Hubigrphas.
You can't import the graphs themselves, but if it uses LTS you can import that data. Just take the data from your Hubigraphs LTS data and put it in the file created by webcore graphs. The two apps use a different format, but webcore will update the Hubigraphs data to the new format.