If everything else is working, you can just upgrade the temperature/humidity sensor.
https://www.davisinstruments.com/products/temperaturehumidity-digital-sensor-board-for-vantage-pro2?variant=39617709736097&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&srsltid=AfmBOorparqXUIbseeL_GhV5N17nRIgTP_lbR-ppJqHdstP_M-IQILrfUH0&com_cvv=8fb3d522dc163aeadb66e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c