TL/DR: this is super generic "convert serial device to LCD display using Arduino" tutorial, this time talking to RS-485 equipped anemometer.
Looks like the anemometer itself can only be purchased from manufacturer, for $73 + unknown shipping, and using "contact us" form only (there is no web store) [0]. And the datasheet is available by request only. Normally this would disqualify any product, but $73 is very cheap for ultrasonic anemometers, so if you really have a need for one, this is something to consider.
(but the implementation in the article itself is NOT the approach I'd recommend.. If you are buying $100 sensor, don't pair it with tiny $3 display with tiny hard-to-read letters, spend a few dollars more and get yourself a nicer, bigger display. And while at it, might as well take advantage of RS485 multipoint nature and stick a thermometer in that empty louver box underneath the device)
Less fun because nothing can be build, although the transmitted data conforms to standards and can be processed with for example https://github.com/merbanan/rtl_433. So one can gather all data with a simple dongle and process that with a RPi.