According to your datasheet the Thermistor has 50k @25°C , which should result in V =0.83, if I understand your ascii wiring scheme correctly.
At lower temperatures you get a higher resistance, e.g. 100k @10°C, which would result in V = 0.45.
Higher temperatures provide a higher voltage, e.g. 10k @62.5°C yields V =2.50
Is that in line with your first debug output, [edit:]and what you read with a voltage meter between A5 and GND ?
If no, check your wiring (or correct my understanding)
If yes, check the maths.