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Outdoor Temperature Sensor
(lemmy.world)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
On the high end, the Tempest weather station is pretty great and integrates nicely over the weatherflow2mqtt integration. Obviously, this is far, far more than just temperature, but worthb thinking about.