How to change from "C" to "F" for the outdoor temperature

http://www.lacrossetechnology.com/media/catalog/product/w/s/ws-9611u-it.pdf Here is the method used to set up the outdoor transmitter with the base station

Hi Jim, what make/model station do you have? Normally there is a search function on the main unit to find the outdoor unit. After that they should sync and the outdoor temperature will reflect the temperature of where the outdoor sensor is located.

Hope this helps.

Have you changed the batteries on the outside sender unit?