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I ended up buying a bunch of temperature/humidity/pm2.5 sensors that communicate over Zigbee, then collect the data with Zigbee2MQTT, which was trivial with the mqtt_consumer in Telegraf.

The benefit (or drawback I guess) with your approach is that you can also ingest your neighbors data, if you can reach it :)

I'm gonna stay that's a little more than "a step further"

If you're lucky a neighbour may already have a compatible weather station nearby, which you can freely collect data from as long as you're in range ;)

Davis Instruments is on the pricey end but their WeatherLink Live gateway has a simple local JSON API. For years I scraped it with Prometheus for use in Grafana but I have since switched to HomeAssistant for the analytics/visualization just for simplicity.