Thank you all for the suggestions! I previously used Wundermap, and I liked it, but it won’t even open on recent iPad/iOS devices - unfortunate.
Some of the web pages mentioned come close to what I’m looking for, so I’ll play with those a bit.
I wish there were a simple app that would allow selecting a location, after which it would find the nearest 10-25 stations, then display the data from those stations in a spreadsheet style row & column list to allow easy comparison of the info. Bonus points for allowing the user to select which data to display and the column order of the data, and for allowing drill-down on an individual station’s history info. I’d gladly pay for an app that does this, with or without the useless fancy graphics, icons, alerts, etc. that all apps seem to need these days.