I think you should keep this data separate from the weewx data. No matter what you choose from hi or low it won't make much sense to put it in the weewx archive database since the weewx data is much more detailed (like every 5 minutes). You will always miss the actual hi or low for the day by picking one or averaging. One of my plots shows the hi and low for each day and is interesting to see the daily difference over several years. Also I would be worried that weewx would not like the changes to its database .. others here would know better than I on this point. I don't work on the live data so as to not upset weewx. I always copy the files first. You can blend this data and the weewx data programmatically and not miss the hi or low data for each hour/day or whatever calculations you want to do. It might make sense to add this data to the weewx stats database. It has daily max and min (and times) values for each measured parameter. I think that's were the NOAA and history display get their data from.
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