Long cable analogue temperature sensors
As the operating current of these guys is around 10uA each, you may get away with little error due to supply current dropping down the cable. The loop resistance of CAT5 is listed as 0.2ohm/m, or 5ohms for 50m one-way. Your 50uA supply current will drop 250uV, which will be entirely negligible compared to their accuracy.

You may find the cable capacitance exceeds what they can drive, so use a 3k resistor on their outputs. It's listed as 52pF/m, or 2.5nF for your cable length, exceeding the 1.1nF limit quoted in the data sheet.

With twisted cables, they may be fairly resistant to interference pickup. Being a temperature measurement, you can put a serious lowpass filter before the ADC, perhaps 1Hz, perhaps 0.1Hz RC if you're happy to read that slow.

Noise is going to be your biggest problem. If you already have some cable, and the sensors, hook one up remotely, one locally, and see.