I've written a weather parser that can pull current temperature, pressure, and humidity data from a nearby PurpleAir outdoor air quality monitor. There are tens of thousands of these installed around the world (check the PurpleAir map).
More details and instructions at https://github.com/medmunds/rainmachine-weather-purpleair
PurpleAir offers free access to the data, no API key necessary. (It's rate limited, but a RainMachine's needs fall well within their limits.)
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