Whats a low temperature adapter?

I just bought an Acu-Rite wireless weather station (model 00592w) that tells me the outdoor and indoor temperature and humidity levels. It came with a wire that plugs into the side of the outdoor wireless sensor and it says on the front of the manual that its a "low temperature adapter" and i don't exactly know what it does and if it's necessary to plug into the outdoor sensor. The wire is about 12 feet long and it has a probe at the end. If anyone can at least tell me what it does because the manual says NOTHING about it. Please help!